結果
| 問題 |
No.187 中華風 (Hard)
|
| コンテスト | |
| ユーザー |
snuke
|
| 提出日時 | 2018-06-09 02:45:58 |
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,144 bytes |
| コンパイル時間 | 1,543 ms |
| コンパイル使用メモリ | 164,852 KB |
| 実行使用メモリ | 6,948 KB |
| 最終ジャッジ日時 | 2024-06-30 12:20:57 |
| 合計ジャッジ時間 | 5,476 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 22 WA * 3 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:80:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
80 | scanf("%d",&n);
| ~~~~~^~~~~~~~~
main.cpp:82:17: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
82 | rep(i,n) scanf("%d%d",&r[i],&p[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~
ソースコード
#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define maxs(x,y) (x = max(x,y))
#define mins(x,y) (x = min(x,y))
#define limit(x,l,r) max(l,min(x,r))
#define lims(x,l,r) (x = max(l,min(x,r)))
#define isin(x,l,r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)),x.end())
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define show(x) cout<<#x<<" = "<<x<<endl;
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define bn(x) ((1<<x)-1)
#define dup(x,y) (((x)+(y)-1)/(y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
inline int in() { int x; scanf("%d",&x); return x;}
template<typename T>inline istream& operator>>(istream&i,v(T)&v)
{rep(j,sz(v))i>>v[j];return i;}
template<typename T>string join(const v(T)&v)
{stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}
template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v)
{if(sz(v))o<<join(v);return o;}
template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v)
{return i>>v.fi>>v.se;}
template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v)
{return o<<v.fi<<","<<v.se;}
template<typename T>inline ll suma(const v(T)& a) { ll res(0); for (auto&& x : a) res += x; return res;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("-1"); return 0;}
#define yn {puts("YES");}else{puts("NO");}
const int MX = 200005;
const int mod = 1000000007;
#define bsf __builtin_ctzll
ll gcd(ll a, ll b) {
// a = abs(a); b = abs(b);
if (!a || !b) return a|b;
int t = bsf(a|b); a >>= bsf(a);
do { b >>= bsf(b); if (a > b) swap(a, b); b -= a;} while (b);
return a << t;
}
// ax+by = gcd(a,b)
ll extgcd(ll a, ll b, ll& x, ll& y) {
for (ll u = y = 1, v = x = 0; a;) {
ll q = b / a; swap(x -= q * u, u);
swap(y -= q * v, v); swap(b -= q * a, a);
}
return b;
}
//
inline int inv(int a, int p) {
ll x, y;
extgcd(a,p,x,y);
return (x%p+p)%p;
}
int main() {
int n;
scanf("%d",&n);
vi r(n), p(n);
rep(i,n) scanf("%d%d",&r[i],&p[i]);
vl x;
rep(i,n) {
rep(j,i) {
int g = gcd(p[i],p[j]);
if (r[i]%g != r[j]%g) dame;
p[i] /= g;
r[i] %= p[i];
}
ll a = r[i], c = 1;
rep(j,i) {
a -= x[j]*c%p[i];
if (a < 0) a += p[i];
c = c*p[j]%p[i];
}
rep(j,i) a = a*inv(p[j],p[i])%p[i];
x.pb(a);
// cerr<<r[i]<<" "<<p[i]<<" "<<a<<endl;
}
ll ans = 0, c = 1;
rep(i,n) {
(ans += x[i]*c) %= mod;
c = c*p[i]%mod;
}
cout<<ans<<endl;
return 0;
}
snuke