Submission #712204

#	Time	Username	Problem	Language	Result	Execution time	Memory
712204		raysh07	Horses (IOI15_horses)	C++17	0 / 100	53 ms	16004 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
int n;
const int N = 5e5 + 69;
const int mod = 1e9 + 7;
ll x[N], y[N];

int init(int N, int X[], int Y[]) {
    n = N;
    for (int i=1; i<=n; i++)
    x[i] = X[i-1];
    for (int i=1; i<=n; i++)
    y[i] = Y[i-1];
    
    ll best = 0;
    int pos = -1;
    ll mult = 1;
    for (int i=n; i>=1; i--){
        if (best * mult <= y[i]){
            mult = 1;
            best = y[i];
            pos = i;
        }
        mult *= x[i-1];
        if (mult >= (ll)1e9) break;
    }
    
    assert(pos != -1);
    
    ll ans = 0;
    for (int i=1; i<=pos; i++)
    ans = (ans * x[i]) % mod;
    
    ans *= y[pos]; ans %= mod;
    int rans = ans;
	return rans;
}

int updateX(int pos, int val) {	
    pos++;
    x[pos] = val;
	ll best = 0;
    pos = -1;
    ll mult = 1;
    for (int i=n; i>=1; i--){
        if (best * mult <= y[i]){
            mult = 1;
            best = y[i];
            pos = i;
        }
        mult *= x[i-1];
        if (mult >= (ll)1e9) break;
    }
    
    assert(pos != -1);
    
    ll ans = 0;
    for (int i=1; i<=pos; i++)
    ans = (ans * x[i]) % mod;
    
    ans *= y[pos]; ans %= mod;
     int rans = ans;
	return rans;
}

int updateY(int pos, int val) {
    pos++;
    y[pos] = val;
    
	ll best = 0;
    pos = -1;
    ll mult = 1;
    for (int i=n; i>=1; i--){
        if (best * mult <= y[i]){
            mult = 1;
            best = y[i];
            pos = i;
        }
        mult *= x[i-1];
        if (mult >= (ll)1e9) break;
    }
    
    assert(pos != -1);
    
    ll ans = 0;
    for (int i=1; i<=pos; i++)
    ans = (ans * x[i]) % mod;
    
    ans *= y[pos]; ans %= mod;
	 int rans = ans;
	return rans;
}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:10:14: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   10 | int init(int N, int X[], int Y[]) {
      |          ~~~~^
horses.cpp:6:11: note: shadowed declaration is here
    6 | const int N = 5e5 + 69;
      |           ^
horses.cpp:37:16: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   37 |     int rans = ans;
      |                ^~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:64:17: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   64 |      int rans = ans;
      |                 ^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:92:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   92 |   int rans = ans;
      |              ^~~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23