제출 #620743

#제출 시각아이디문제언어결과실행 시간메모리
620743Hazem말 (IOI15_horses)C++14
37 / 100
100 ms20644 KiB
#include <bits/stdc++.h> #define LL long long using namespace std; const int M = 5e5+10; const int MOD = 1e9+7; LL add(LL a,LL b){ return (a+b)%MOD; } LL mult(LL a,LL b){ return (a*b)%MOD; } LL fastpow(LL n,LL k){ LL ret = 1; while(k){ if(k&1)ret = mult(ret,n); k /= 2; n = mult(n,n); } return ret; } LL divide(LL a,LL b){ return mult(a,fastpow(b,MOD-2)); } LL a[M],b[M],n; LL pr = 1; LL calc(){ LL idx = max(1ll,n-30),cur = 1; for(int i=idx+1;i<=n;i++){ if((cur*a[i]>b[idx])||(cur*a[i]*b[i]>b[idx])) idx = i,cur = 1; else cur *= a[i]; } cur = 1; for(int i=max(1ll,n-30);i<=idx;i++) cur = mult(cur,a[i]); return mult(mult(cur,pr),b[idx]); } int init(int N, int X[], int Y[]) { n = N; a[0] = 1; for(int i=1;i<=n;i++){ a[i] = X[i-1]; b[i] = Y[i-1]; if(i<n-30) pr = mult(pr,a[i]); } return calc(); } int updateX(int pos, int val) { if(pos+1<n-30){ pr = divide(pr,a[pos+1]); pr = mult(pr,val); } a[pos+1] = val; return calc(); } int updateY(int pos, int val) { b[pos+1] = val; return calc(); }

컴파일 시 표준 에러 (stderr) 메시지

horses.cpp: In function 'long long int calc()':
horses.cpp:40:15: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   40 |  for(int i=idx+1;i<=n;i++){
      |            ~~~^~
horses.cpp:49:15: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   49 |  for(int i=max(1ll,n-30);i<=idx;i++)
      |            ~~~^~~~~~~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:66:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   66 |  return calc();
      |         ~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:77:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   77 |  return calc();
      |         ~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:84:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   84 |  return calc();
      |         ~~~~^~
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