結果
問題 | No.1470 Mex Sum |
ユーザー | hamray |
提出日時 | 2021-10-26 20:00:15 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 18 ms / 2,000 ms |
コード長 | 8,411 bytes |
コンパイル時間 | 2,213 ms |
コンパイル使用メモリ | 173,356 KB |
実行使用メモリ | 6,820 KB |
最終ジャッジ日時 | 2024-10-05 21:39:53 |
合計ジャッジ時間 | 5,065 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 2 ms
5,248 KB |
testcase_01 | AC | 2 ms
5,248 KB |
testcase_02 | AC | 3 ms
5,248 KB |
testcase_03 | AC | 3 ms
5,248 KB |
testcase_04 | AC | 3 ms
5,248 KB |
testcase_05 | AC | 3 ms
5,248 KB |
testcase_06 | AC | 3 ms
5,248 KB |
testcase_07 | AC | 3 ms
5,248 KB |
testcase_08 | AC | 3 ms
5,248 KB |
testcase_09 | AC | 3 ms
5,248 KB |
testcase_10 | AC | 3 ms
5,248 KB |
testcase_11 | AC | 3 ms
5,248 KB |
testcase_12 | AC | 17 ms
5,248 KB |
testcase_13 | AC | 17 ms
5,248 KB |
testcase_14 | AC | 17 ms
5,248 KB |
testcase_15 | AC | 16 ms
5,248 KB |
testcase_16 | AC | 16 ms
5,248 KB |
testcase_17 | AC | 17 ms
5,248 KB |
testcase_18 | AC | 17 ms
5,248 KB |
testcase_19 | AC | 17 ms
5,248 KB |
testcase_20 | AC | 17 ms
5,248 KB |
testcase_21 | AC | 17 ms
5,248 KB |
testcase_22 | AC | 17 ms
5,248 KB |
testcase_23 | AC | 17 ms
5,248 KB |
testcase_24 | AC | 18 ms
5,248 KB |
testcase_25 | AC | 17 ms
5,248 KB |
testcase_26 | AC | 17 ms
5,248 KB |
testcase_27 | AC | 18 ms
5,248 KB |
testcase_28 | AC | 17 ms
5,248 KB |
testcase_29 | AC | 18 ms
5,248 KB |
testcase_30 | AC | 17 ms
5,248 KB |
testcase_31 | AC | 17 ms
6,816 KB |
testcase_32 | AC | 17 ms
6,816 KB |
testcase_33 | AC | 17 ms
6,820 KB |
testcase_34 | AC | 18 ms
6,820 KB |
testcase_35 | AC | 18 ms
6,820 KB |
testcase_36 | AC | 17 ms
6,816 KB |
testcase_37 | AC | 13 ms
6,816 KB |
testcase_38 | AC | 13 ms
6,816 KB |
testcase_39 | AC | 14 ms
6,816 KB |
testcase_40 | AC | 15 ms
6,816 KB |
testcase_41 | AC | 15 ms
6,816 KB |
testcase_42 | AC | 15 ms
6,816 KB |
testcase_43 | AC | 15 ms
6,820 KB |
testcase_44 | AC | 15 ms
6,816 KB |
testcase_45 | AC | 14 ms
6,816 KB |
testcase_46 | AC | 14 ms
6,820 KB |
testcase_47 | AC | 15 ms
6,816 KB |
testcase_48 | AC | 15 ms
6,816 KB |
testcase_49 | AC | 15 ms
6,816 KB |
testcase_50 | AC | 16 ms
6,816 KB |
ソースコード
#include <bits/stdc++.h>//#include <atcoder/all>//using namespace atcoder;#pragma GCC target ("avx2")#pragma GCC optimization ("O3")#pragma GCC optimization ("unroll-loops")using namespace std;typedef vector<int> VI;typedef vector<VI> VVI;typedef vector<string> VS;typedef pair<int, int> PII;typedef pair<int, int> pii;typedef pair<long long, long long> PLL;typedef pair<int, PII> TIII;typedef long long ll;typedef long double ld;typedef unsigned long long ull;#define FOR(i, s, n) for (int i = s; i < (int)n; ++i)#define REP(i, n) FOR(i, 0, n)#define rep(i, a, b) for (int i = a; i < (b); ++i)#define trav(a, x) for (auto &a : x)#define all(x) x.begin(), x.end()#define MOD 1000000007template<class T1, class T2> inline bool chmax(T1 &a, T2 b) {if (a < b) {a = b; return true;} return false;}template<class T1, class T2> inline bool chmin(T1 &a, T2 b) {if (a > b) {a = b; return true;} return false;}const double EPS = 1e-8, PI = acos(-1);const double pi = 3.141592653589793238462643383279;//ここから編集typedef string::const_iterator State;ll GCD(ll a, ll b){return (b==0)?a:GCD(b, a%b);}ll LCM(ll a, ll b){return a/GCD(a, b) * b;}template< int mod >struct ModInt {int x;ModInt() : x(0) {}ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}ModInt &operator+=(const ModInt &p) {if((x += p.x) >= mod) x -= mod;return *this;}ModInt &operator-=(const ModInt &p) {if((x += mod - p.x) >= mod) x -= mod;return *this;}ModInt &operator*=(const ModInt &p) {x = (int) (1LL * x * p.x % mod);return *this;}ModInt &operator/=(const ModInt &p) {*this *= p.inverse();return *this;}ModInt operator-() const { return ModInt(-x); }ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; }ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; }ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; }ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; }bool operator==(const ModInt &p) const { return x == p.x; }bool operator!=(const ModInt &p) const { return x != p.x; }ModInt inverse() const {int a = x, b = mod, u = 1, v = 0, t;while(b > 0) {t = a / b;swap(a -= t * b, b);swap(u -= t * v, v);}return ModInt(u);}ModInt pow(int64_t n) const {ModInt ret(1), mul(x);while(n > 0) {if(n & 1) ret *= mul;mul *= mul;n >>= 1;}return ret;}friend ostream &operator<<(ostream &os, const ModInt &p) {return os << p.x;}friend istream &operator>>(istream &is, ModInt &a) {int64_t t;is >> t;a = ModInt< mod >(t);return (is);}static int get_mod() { return mod; }};using modint = ModInt< 1000000007 >;template< typename T >struct Combination {vector< T > _fact, _rfact, _inv;Combination(int sz) : _fact(sz + 1), _rfact(sz + 1), _inv(sz + 1) {_fact[0] = _rfact[sz] = _inv[0] = 1;for(int i = 1; i <= sz; i++) _fact[i] = _fact[i - 1] * i;_rfact[sz] /= _fact[sz];for(int i = sz - 1; i >= 0; i--) _rfact[i] = _rfact[i + 1] * (i + 1);for(int i = 1; i <= sz; i++) _inv[i] = _rfact[i] * _fact[i - 1];}inline T fact(int k) const { return _fact[k]; }inline T rfact(int k) const { return _rfact[k]; }inline T inv(int k) const { return _inv[k]; }T P(int n, int r) const {if(r < 0 || n < r) return 0;return fact(n) * rfact(n - r);}T C(int p, int q) const {if(q < 0 || p < q) return 0;return fact(p) * rfact(q) * rfact(p - q);}T H(int n, int r) const {if(n < 0 || r < 0) return (0);return r == 0 ? 1 : C(n + r - 1, r);}};ll modpow(ll x, ll n, ll mod) {ll res = 1;x %= mod;if(x == 0) return 0;while(n) {if(n&1) res = (res * x) % mod;x = (x * x) % mod;n >>= 1;}return res;}inline long long mod(long long a, long long m) {return (a % m + m) % m;}template<typename T>struct BIT{int N;std::vector<T> node;BIT(){}BIT(int n){N = n;node.resize(N+10);}void build(int n) {N = n;node.resize(N+10);}/* a: 1-indexed */void add(int a, T x){for(int i=a; i<(int)node.size(); i += i & -i) node[i] += x;}/* [1, a] */T sum(int a){T res = 0;for(int x=a; x>0; x -= x & -x) res += node[x];return res;}/* [l, r] */T rangesum(int l, int r){return sum(r) - sum(l-1);}/*a1+a2+...+aw >= valとなるような最小のwを返す@verify https://codeforces.com/contest/992/problem/E*/int lower_bound(T val) {if(val < 0) return 0;int res = 0;int n = 1;while (n < N) n *= 2;T tv=0;for (int k = n; k > 0; k /= 2) {if(res + k < N && node[res + k] < val){val -= node[res+k];res += k;}}return res+1;}};struct UnionFind{std::vector<int> par;std::vector<int> siz;UnionFind(int sz_): par(sz_), siz(sz_) {for(int i=0; i<sz_; ++i) par[i] = i, siz[i] = 1;}void init(int sz_){par.resize(sz_);siz.resize(sz_);for(int i=0; i<sz_; ++i) par[i] = i, siz[i] = 1;}int root(int x){if(x == par[x]) return x;return par[x] = root(par[x]);}bool merge(int x, int y){x = root(x), y = root(y);if(x == y) return false;if(siz[x] < siz[y]) std::swap(x, y);siz[x] += siz[y];par[y] = x;return true;}bool issame(int x, int y){return root(x) == root(y);}int size(int x){return siz[root(x)];}};struct RollingHash{using ull = unsigned long long;const ull mod = (1ULL << 61) - 1;const ull MASK30 = (1ULL << 30) - 1;const ull MASK31 = (1ULL << 31) - 1;const ull MASK61 = mod;ull base;int n;vector<ull> hash, pow;RollingHash(const string &s){random_device rnd;mt19937_64 mt(rnd());base = 1001;n = (int)s.size();hash.assign(n+1, 0);pow.assign(n+1, 1);for(int i=0; i<n; i++){hash[i+1] = calc_mod(mul(hash[i], base) + s[i]);pow[i+1] = calc_mod(mul(pow[i], base));}}ull calc_mod(ull x){ull xu = x >> 61;ull xd = x & MASK61;ull res = xu + xd;if(res >= mod) res -= mod;return res;}ull mul(ull a, ull b){ull au = a >> 31;ull ad = a & MASK31;ull bu = b >> 31;ull bd = b & MASK31;ull mid = ad * bu + au * bd;ull midu = mid >> 30;ull midd = mid & MASK30;return calc_mod(au * bu * 2 + midu + (midd << 31) + ad * bd);}//[l,r)のハッシュ値inline ull get(int l, int r){ull res = calc_mod(hash[r] + mod*3-mul(hash[l], pow[r-l]));return res;}//string tのハッシュ値inline ull get(string t){ull res = 0;for(int i=0; i<t.size(); i++){res = calc_mod(mul(res, base)+t[i]);}return res;}//string s中のtの数をカウントinline int count(string t) {if(t.size() > n) return 0;auto hs = get(t);int res = 0;for(int i=0; i<n-t.size()+1; i++){if(get(i, i+t.size()) == hs) res++;}return res;}/*concat@verify https://codeforces.com/problemset/problem/514/C*/inline ull concat(ull h1, ull h2, int h2len){return calc_mod(h2 + mul(h1, pow[h2len]));}// LCPを求める S[a:] T[b:]inline int LCP(int a, int b){int len = min((int)hash.size()-a, (int)hash.size()-b);int lb = -1, ub = len;while(ub-lb>1){int mid = (lb+ub)/2;if(get(a, a+mid) == get(b, b+mid)) lb = mid;else ub = mid;}return lb;}};int main() {cin.tie(0);ios::sync_with_stdio(false);cout << fixed << setprecision(12);int n; cin >> n;vector<int> a(n);int cnt1=0,cnt2=0;REP(i,n) {cin >> a[i];if(a[i] == 1) cnt1++;if(a[i] == 2) cnt2++;}ll t = n-cnt1;ll ans = 0;//1,2ans += 3LL*cnt1*cnt2;//1,1ans += 2LL*cnt1*(n-cnt2-1+n-cnt1-cnt2)/2;ans += t*(t-1)/2;cout << ans << endl;return 0;}