//#pragma GCC optimize ("-O3") #include using namespace std; //@起動時 struct initon { initon() { cin.tie(0); ios::sync_with_stdio(false); cout.setf(ios::fixed); cout.precision(16); srand((unsigned) clock() + (unsigned) time(NULL)); }; } __initon; //衝突対策 #define ws ___ws struct T { int f, s, t; T() { f = -1, s = -1, t = -1; } T(int f, int s, int t) : f(f), s(s), t(t) {} bool operator<(const T &r) const { return f != r.f ? f < r.f : s != r.s ? s < r.s : t < r.t; //return f != r.f ? f > r.f : s != r.s ? s > r.s : t > r.t; 大きい順 } bool operator>(const T &r) const { return f != r.f ? f > r.f : s != r.s ? s > r.s : t > r.t; //return f != r.f ? f > r.f : s != r.s ? s > r.s : t > r.t; 小さい順 } bool operator==(const T &r) const { return f == r.f && s == r.s && t == r.t; } bool operator!=(const T &r) const { return f != r.f || s != r.s || t != r.t; } int operator[](int i) { assert(i < 3); return i == 0 ? f : i == 1 ? s : t; } }; #define int long long #define ll long long //#define double long double #define ull unsigned long long using dou = double; using itn = int; using str = string; using bo= bool; #define au auto using P = pair; #define fi first #define se second #define vec vector #define beg begin #define rbeg rbegin #define con continue #define bre break #define brk break #define is == //マクロ省略系 コンテナ using vi = vector; #define _overloadvvi(_1, _2, _3, _4, name, ...) name #define vvi0() vec #define vvi1(a) vec a #define vvi2(a, b) vec a(b) #define vvi3(a, b, c) vec a(b,vi(c)) #define vvi4(a, b, c, d) vec a(b,vi(c,d)) #define vvi(...) _overloadvvi(__VA_ARGS__,vvi4,vvi3,vvi2 ,vvi1,vvi0)(__VA_ARGS__) using vl = vector; #define _overloadvvl(_1, _2, _3, _4, name, ...) name #define vvl1(a) vec a #define vvl2(a, b) vec a(b) #define vvl3(a, b, c) vec a(b,vl(c)) #define vvl4(a, b, c, d) vec a(b,vl(c,d)) #define vvl(...) _overloadvvl(__VA_ARGS__,vvl4,vvl3,vvl2 ,vvl1)(__VA_ARGS__) using vb = vector; #define _overloadvvb(_1, _2, _3, _4, name, ...) name #define vvb1(a) vec a #define vvb2(a, b) vec a(b) #define vvb3(a, b, c) vec a(b,vb(c)) #define vvb4(a, b, c, d) vec a(b,vb(c,d)) #define vvb(...) _overloadvvb(__VA_ARGS__,vvb4,vvb3,vvb2 ,vvb1)(__VA_ARGS__) using vs = vector; #define _overloadvvs(_1, _2, _3, _4, name, ...) name #define vvs1(a) vec a #define vvs2(a, b) vec a(b) #define vvs3(a, b, c) vec a(b,vs(c)) #define vvs4(a, b, c, d) vec a(b,vs(c,d)) #define vvs(...) _overloadvvs(__VA_ARGS__,vvs4,vvs3,vvs2 ,vvs1)(__VA_ARGS__) using vd = vector; #define _overloadvvd(_1, _2, _3, _4, name, ...) name #define vvd1(a) vec a #define vvd2(a, b) vec a(b) #define vvd3(a, b, c) vec a(b,vd(c)) #define vvd4(a, b, c, d) vec a(b,vd(c,d)) #define vvd(...) _overloadvvd(__VA_ARGS__,vvd4,vvd3,vvd2 ,vvd1)(__VA_ARGS__) using vc=vector; #define _overloadvvc(_1, _2, _3, _4, name, ...) name #define vvc1(a) vec a #define vvc2(a, b) vec a(b) #define vvc3(a, b, c) vec a(b,vc(c)) #define vvc4(a, b, c, d) vec a(b,vc(c,d)) #define vvc(...) _overloadvvc(__VA_ARGS__,vvc4,vvc3,vvc2 ,vvc1)(__VA_ARGS__) using vp = vector

; #define _overloadvvp(_1, _2, _3, _4, name, ...) name #define vvp1(a) vec a #define vvp2(a, b) vec a(b) #define vvp3(a, b, c) vec a(b,vp(c)) #define vvp4(a, b, c, d) vec a(b,vp(c,d)) using vt = vector; #define _overloadvvt(_1, _2, _3, _4, name, ...) name #define vvt1(a) vec a #define vvt2(a, b) vec a(b) #define vvt3(a, b, c) vec a(b,vt(c)) #define vvt4(a, b, c, d) vec a(b,vt(c,d)) #define v3i(a, b, c, d) vector> a(b, vector(c, vi(d))) #define v3d(a, b, c, d) vector> a(b, vector(c, vd(d))) #define v3m(a, b, c, d) vector> a(b, vector(c, vm(d))) #define _vvi vector #define _vvl vector #define _vvb vector #define _vvs vector #define _vvd vector #define _vvc vector #define _vvp vector #define PQ priority_queue, greater > #define tos to_string using mapi = map; using mapd = map; using mapc = map; using maps = map; using seti = set; using setd = set; using setc = set; using sets = set; using qui = queue; #define bset bitset #define uset unordered_set #define mset multiset #define umap unordered_map #define umapi unordered_map #define umapp unordered_map #define mmap multimap //マクロ 繰り返し #define _overloadrep(_1, _2, _3, _4, name, ...) name # define _rep(i, n) for(int i = 0,_lim=n; i < _lim ; i++) #define repi(i, m, n) for(int i = m,_lim=n; i < _lim ; i++) #define repadd(i, m, n, ad) for(int i = m,_lim=n; i < _lim ; i+= ad) #define rep(...) _overloadrep(__VA_ARGS__,repadd,repi,_rep,)(__VA_ARGS__) #define _rer(i, n) for(int i = n; i >= 0 ; i--) #define reri(i, m, n) for(int i = m,_lim=n; i >= _lim ; i--) #define rerdec(i, m, n, dec) for(int i = m,_lim=n; i >= _lim ; i-=dec) #define rer(...) _overloadrep(__VA_ARGS__,rerdec,reri,_rer,)(__VA_ARGS__) #define fora(a, b) for(auto&& a : b) //マクロ 定数 #define k3 1010 #define k4 10101 #define k5 101010 #define k6 1010101 #define k7 10101010 const int inf = (int) 1e9 + 100; const ll linf = (ll) 1e18 + 100; const double eps = 1e-9; const double PI = 3.1415926535897932384626433832795029L; ll ma = numeric_limits::min(); ll mi = numeric_limits::max(); const int y4[] = {-1, 1, 0, 0}; const int x4[] = {0, 0, -1, 1}; const int y8[] = {0, 1, 0, -1, -1, 1, 1, -1}; const int x8[] = {1, 0, -1, 0, 1, -1, 1, -1}; //マクロ省略形 関数等 #define arsz(a) (sizeof(a)/sizeof(a[0])) #define sz(a) ((int)(a).size()) #define rs resize #define mp make_pair #define pb push_back #define pf push_front #define eb emplace_back #define all(a) (a).begin(),(a).end() #define rall(a) (a).rbegin(),(a).rend() inline void sort(string &a) { sort(a.begin(), a.end()); } template inline void sort(vector &a) { sort(a.begin(), a.end()); }; template inline void sort(vector &a, int len) { sort(a.begin(), a.begin() + len); }; template inline void sort(vector &a, F f) { sort(a.begin(), a.end(), [&](T l, T r) { return f(l) < f(r); }); }; enum ___pcomparator { fisi, fisd, fdsi, fdsd, sifi, sifd, sdfi, sdfd }; inline void sort(vector

&a, ___pcomparator type) { switch (type) { case fisi: sort(all(a), [&](P l, P r) { return l.fi != r.fi ? l.fi < r.fi : l.se < r.se; }); break; case fisd: sort(all(a), [&](P l, P r) { return l.fi != r.fi ? l.fi < r.fi : l.se > r.se; }); break; case fdsi: sort(all(a), [&](P l, P r) { return l.fi != r.fi ? l.fi > r.fi : l.se < r.se; }); break; case fdsd: sort(all(a), [&](P l, P r) { return l.fi != r.fi ? l.fi > r.fi : l.se > r.se; }); break; case sifi: sort(all(a), [&](P l, P r) { return l.se != r.se ? l.se < r.se : l.fi < r.fi; }); break; case sifd: sort(all(a), [&](P l, P r) { return l.se != r.se ? l.se < r.se : l.fi > r.fi; }); break; case sdfi: sort(all(a), [&](P l, P r) { return l.se != r.se ? l.se > r.se : l.fi < r.fi; }); break; case sdfd: sort(all(a), [&](P l, P r) { return l.se != r.se ? l.se > r.se : l.fi > r.fi; }); break; } }; inline void sort(vector &a, ___pcomparator type) { switch (type) { case fisi: sort(all(a), [&](T l, T r) { return l.f != r.f ? l.f < r.f : l.s < r.s; }); break; case fisd: sort(all(a), [&](T l, T r) { return l.f != r.f ? l.f < r.f : l.s > r.s; }); break; case fdsi: sort(all(a), [&](T l, T r) { return l.f != r.f ? l.f > r.f : l.s < r.s; }); break; case fdsd: sort(all(a), [&](T l, T r) { return l.f != r.f ? l.f > r.f : l.s > r.s; }); break; case sifi: sort(all(a), [&](T l, T r) { return l.s != r.s ? l.s < r.s : l.f < r.f; }); break; case sifd: sort(all(a), [&](T l, T r) { return l.s != r.s ? l.s < r.s : l.f > r.f; }); break; case sdfi: sort(all(a), [&](T l, T r) { return l.s != r.s ? l.s > r.s : l.f < r.f; }); break; case sdfd: sort(all(a), [&](T l, T r) { return l.s != r.s ? l.s > r.s : l.f > r.f; }); break; } }; template inline void rsort(vector &a) { sort(a.begin(), a.end(), greater()); }; template inline void rsort(vector &a, int len) { sort(a.begin(), a.begin() + len, greater()); }; template inline void rsort(vector &a, F f) { sort(a.begin(), a.end(), [&](U l, U r) { return f(l) > f(r); }); }; template inline void sortp(vector &a, vector &b) { vp c; int n = sz(a); assert(n == sz(b)); rep(i, n)c.eb(a[i], b[i]); sort(c); rep(i, n) { a[i] = c[i].first; b[i] = c[i].second;; } }; //F = T //例えばreturn p.fi + p.se; template inline void sortp(vector &a, vector &b, F f) { vp c; int n = sz(a); assert(n == sz(b)); rep(i, n)c.eb(a[i], b[i]); sort(c, f); rep(i, n) { a[i] = c[i].first; b[i] = c[i].second; } }; template inline void sortp(vector &a, vector &b, char type) { vp c; int n = sz(a); assert(n == sz(b)); rep(i, n)c.eb(a[i], b[i]); sort(c, type); rep(i, n) { a[i] = c[i].first; b[i] = c[i].second; } }; template inline void rsortp(vector &a, vector &b) { vp c; int n = sz(a); assert(n == sz(b)); rep(i, n)c.eb(a[i], b[i]); rsort(c); rep(i, n) { a[i] = c[i].first; b[i] = c[i].second; } }; template inline void rsortp(vector &a, vector &b, F f) { vp c; int n = sz(a); assert(n == sz(b)); rep(i, n)c.eb(a[i], b[i]); rsort(c, f); rep(i, n) { a[i] = c[i].first; b[i] = c[i].second; } }; template inline void sortt(vector &a, vector &b, vector &c) { vt r; int n = sz(a); assert(n == sz(b)); assert(n == sz(c)); rep(i, n)r.eb(a[i], b[i], c[i]); sort(r); rep(i, n) { a[i] = r[i].f; b[i] = r[i].s; c[i] = r[i].t; } }; template inline void sortt(vector &a, vector &b, vector &c, F f) { vt r; int n = sz(a); assert(n == sz(b)); assert(n == sz(c)); rep(i, n)r.eb(a[i], b[i], c[i]); sort(r, f); rep(i, n) { a[i] = r[i].f; b[i] = r[i].s; c[i] = r[i].t; } }; template inline void rsortt(vector &a, vector &b, vector &c, F f) { vt r; int n = sz(a); assert(n == sz(b)); assert(n == sz(c)); rep(i, n)r.eb(a[i], b[i], c[i]); rsort(r, f); rep(i, n) { a[i] = r[i].f; b[i] = r[i].s; c[i] = r[i].t; } }; template inline void sort2(vector> &a) { for (int i = 0, n = a.size(); i < n; i++)sort(a[i]); } template inline void rsort2(vector> &a) { for (int i = 0, n = a.size(); i < n; i++)rsort(a[i]); } template void fill(A (&a)[N], const T &v) { rep(i, N)a[i] = v; } template void fill(A (&a)[N][O], const T &v) { rep(i, N)rep(j, O)a[i][j] = v; } template void fill(A (&a)[N][O][P], const T &v) { rep(i, N)rep(j, O)rep(k, P)a[i][j][k] = v; } template void fill(A (&a)[N][O][P][Q], const T &v) { rep(i, N)rep(j, O)rep(k, P)rep(l, Q)a[i][j][k][l] = v; } template void fill(A (&a)[N][O][P][Q][R], const T &v) { rep(i, N)rep(j, O)rep(k, P)rep(l, Q)rep(m, R)a[i][j][k][l][m] = v; } template void fill(A (&a)[N][O][P][Q][R][S], const T &v) { rep(i, N)rep(j, O)rep(k, P)rep(l, Q)rep(m, R)rep(n, S)a[i][j][k][l][m][n] = v; } template void fill(V &xx, const T vall) { xx = vall; } template void fill(vector &vecc, const T vall) { for (auto &&vx: vecc) fill(vx, vall); } //@汎用便利関数 入力 template T _in() { T x; cin >> x; return (x); } #define _overloadin(_1, _2, _3, _4, name, ...) name #define in0() _in() #define in1(a) cin>>a #define in2(a, b) cin>>a>>b #define in3(a, b, c) cin>>a>>b>>c #define in4(a, b, c, d) cin>>a>>b>>c>>d #define in(...) _overloadin(__VA_ARGS__,in4,in3,in2 ,in1,in0)(__VA_ARGS__) #define _overloaddin(_1, _2, _3, _4, name, ...) name #define din1(a) int a;cin>>a #define din2(a, b) int a,b;cin>>a>>b #define din3(a, b, c) int a,b,c;cin>>a>>b>>c #define din4(a, b, c, d) int a,b,c,d;cin>>a>>b>>c>>d #define din(...) _overloadin(__VA_ARGS__,din4,din3,din2 ,din1)(__VA_ARGS__) #define _overloaddind(_1, _2, _3, _4, name, ...) name #define din1d(a) int a;cin>>a;a-- #define din2d(a, b) int a,b;cin>>a>>b;a--,b-- #define din3d(a, b, c) int a,b,c;cin>>a>>b>>c;a--,b--,c-- #define din4d(a, b, c, d) int a,b,c,d;cin>>a>>b>>c>>d;;a--,b--,c--,d-- #define dind(...) _overloaddind(__VA_ARGS__,din4d,din3d,din2d ,din1d)(__VA_ARGS__) string sin() { return _in(); } ll lin() { return _in(); } #define na(a, n) a.resize(n); rep(i,n) cin >> a[i]; #define nao(a, n) a.resize(n+1); rep(i,n) cin >> a[i+1]; #define nad(a, n) a.resize(n); rep(i,n){ cin >> a[i]; a[i]--;} #define na2(a, b, n) a.resize(n),b.resize(n);rep(i, n)cin >> a[i] >> b[i]; #define na2d(a, b, n) a.resize(n),b.resize(n);rep(i, n){cin >> a[i] >> b[i];a[i]--,b[i]--;} #define na3(a, b, c, n) a.resize(n),b.resize(n),c.resize(n); rep(i, n)cin >> a[i] >> b[i] >> c[i]; #define na3d(a, b, c, n) a.resize(n),b.resize(n),c.resize(n); rep(i, n){cin >> a[i] >> b[i] >> c[i];a[i]--,b[i]--,c[i]--;} #define nt(a, h, w) resize(a,h,w);rep(hi,h)rep(wi,w) cin >> a[hi][wi]; #define ntd(a, h, w) rs(a,h,w);rep(hi,h)rep(wi,w) cin >> a[hi][wi], a[hi][wi]--; #define ntp(a, h, w) fill(a,'#');rep(hi,1,h+1)rep(wi,1,w+1) cin >> a[hi][wi]; //デバッグ #define sp << " " << #define debugName(VariableName) # VariableName #define _deb1(x) cerr << debugName(x)<<" = "< void rev(vector &a) { reverse(all(a)); } void rev(string &a) { reverse(all(a)); } ll ceil(ll a, ll b) { if (b == 0) { debugline("ceil"); deb(a, b); ole(); return -1; } else return (a + b - 1) / b; } ll sqrt(ll a) { if (a < 0) { debugline("sqrt"); deb(a); ole(); } ll res = (ll) std::sqrt(a); while (res * res < a)res++; return res; } double log(double e, double x) { return log(x) / log(e); } ll sig(ll t) { return (1 + t) * t / 2; } ll sig(ll s, ll t) { return (s + t) * (t - s + 1) / 2; } vi divisors(int v) { vi res; double lim = std::sqrt(v); for (int i = 1; i <= lim; ++i) { if (v % i == 0) { res.pb(i); if (i != v / i)res.pb(v / i); } } return res; } vb isPrime; vi primes; void setPrime() { int len = 4010101; isPrime.resize(4010101); fill(isPrime, true); isPrime[0] = isPrime[1] = false; for (int i = 2; i <= sqrt(len) + 5; ++i) { if (!isPrime[i])continue; for (int j = 2; i * j < len; ++j) { isPrime[i * j] = false; } } rep(i, len)if (isPrime[i])primes.pb(i); } vi factorization(int v) { int tv = v; vi res; if (isPrime.size() == 0)setPrime(); for (auto &&p :primes) { if (v % p == 0)res.push_back(p); while (v % p == 0) { v /= p; } if (v == 1 || p * p > tv)break; } if (v > 1)res.pb(v); return res; } inline bool inside(int h, int w, int H, int W) { return h >= 0 && w >= 0 && h < H && w < W; } inline bool inside(int v, int l, int r) { return l <= v && v < r; } #define ins inside ll u(ll a) { return a < 0 ? 0 : a; } template vector u(const vector &a) { vector ret = a; fora(v, ret)v = u(v); return ret; } #define MIN(a) numeric_limits::min() #define MAX(a) numeric_limits::max() void yn(bool a) { if (a)cout << "yes" << endl; else cout << "no" << endl; } void Yn(bool a) { if (a)cout << "Yes" << endl; else cout << "No" << endl; } void YN(bool a) { if (a)cout << "YES" << endl; else cout << "NO" << endl; } void fyn(bool a) { if (a)cout << "yes" << endl; else cout << "no" << endl; exit(0); } void fYn(bool a) { if (a)cout << "Yes" << endl; else cout << "No" << endl; exit(0); } void fYN(bool a) { if (a)cout << "YES" << endl; else cout << "NO" << endl; exit(0); } void Possible(bool a) { if (a)cout << "Possible" << endl; else cout << "Impossible" << endl; exit(0); } void POSSIBLE(bool a) { if (a)cout << "POSSIBLE" << endl; else cout << "IMPOSSIBLE" << endl; exit(0); } template set &operator+=(set &a, U v) { a.insert(v); return a; } template vector &operator+=(vector &a, U v) { a.pb(v); return a; } template T sum(vector &v, int s = 0, int t = inf) { T ret = 0; rep(i, s, min(sz(v), t))ret += v[i]; return ret; } void mod(int &a, int m) { a = (a % m + m) % m; } template inline int mgr(int ok, int ng, F f) { #define _mgrbody int mid = (ok + ng) / 2; if (f(mid))ok = mid; else ng = mid; if (ok < ng)while (ng - ok > 1) { _mgrbody } else while (ok - ng > 1) { _mgrbody } return ok; } template inline int mgr(int ok, int ng, int second, F f) { #define _mgrbody2 int mid = (ok + ng) / 2; if (f(mid, second))ok = mid; else ng = mid; if (ok < ng) while (ng - ok > 1) { _mgrbody2 } else while (ok - ng > 1) { _mgrbody2 } return ok; } template ostream &operator<<(ostream &os, vector &m) { for (auto &&v:m) os << v << " "; return os; } constexpr bool bget(ll m, int keta) { return (m >> keta) & 1; } int bget(ll m, int keta, int sinsuu) { m /= (ll) pow(sinsuu, keta); return m % sinsuu; } ll bit(int n) { return (1LL << (n)); } ll bit(int n, int sinsuu) { return (ll) pow(sinsuu, n); } int mask(int n) { return (1ll << n) - 1; } #define bcou __builtin_popcountll template vector ruiv(vector &a) { vector ret(a.size() + 1); rep(i, a.size())ret[i + 1] = ret[i] + a[i]; return ret; } template inline bool chma(T &a, const U &b) { if (a < b) { a = b; return true; } return false; } template inline bool chma(const U &b) { return chma(ma, b); } template inline bool chmi(T &a, const U &b) { if (b < a) { a = b; return true; } return false; } template inline bool chmi(const U &b) { return chmi(mi, b); } #define unique(v) v.erase( unique(v.begin(), v.end()), v.end() ); int max(vi &a) { int res = a[0]; fora(v, a) { res = max(res, v); } return res; } int min(vi &a) { int res = a[0]; fora(v, a) { res = min(res, v); } return res; } template void out(T &&head, U &&... tail) { cout << head << " "; out2(tail...); cout << "" << endl;} template void out(T &&head) { cout << head << endl;} void out() { cout << "" << endl;} int N, M, H, W; vi A, B, C; signed main() { din(a,b); dou S=0; dou i=a; while(i <= b){ S += 1/1e6 * abs((i-a)*(i-b)); i += 1/1e6; } out(S); }