Submission #206095

#	Time	Username	Problem	Language	Result	Execution time	Memory
206095		Segtree	Horses (IOI15_horses)	C++14	17 / 100	1596 ms	12152 KiB

horses

#include"horses.h"
#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
typedef long long ll;
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define all(x) x,begin(),x.end()
#define rep(i,n) for(int i=0;i<n;i++)
#define mod 1000000007
#define mad(a,b) a=(a+b)%mod
ll N,X[500010],Y[500010];
int solve(){
	ll rui=1,p;
	for(int i=N-1;i>=0;i--){
		rui*=X[i];
		if(rui<=(ll)1e9)p=i;
		else break;
	}
	ll ans=Y[p];
	rui=1;
	for(int i=p+1;i<N;i++){
		rui*=X[i];
		chmax(ans,rui*Y[i]);
	}
	ans%=mod;
	for(int i=0;i<=p;i++)ans=ans*X[i]%mod;
	return ans;
}
int init(int n,int x[],int y[]){
	N=n;
	rep(i,N)X[i]=x[i],Y[i]=y[i];
	return solve();
}
int updateX(int pos,int val){
	X[pos]=val;
	return solve();
}
int updateY(int pos,int val){
	Y[pos]=val;
	return solve();
}/*
int main(){
	cin>>N;
	rep(i,N)cin>>X[i];
	rep(i,N)cin>>Y[i];
	N=1000;
	rep(i,N)X[i]=1;
	rep(i,N)Y[i]=rand()%(ll)1e9+1;
	cout<<init(N,X,Y)<<endl;
	while(1){
		string type; ll pos,val;
		cin>>type>>pos>>val;
		if(type=="X")cout<<updateX(pos,val)<<endl;
		if(type=="Y")cout<<updateY(pos,val)<<endl;
	}
	
}*/

Compilation message (stderr)

horses.cpp: In function 'int solve()':
horses.cpp:17:13: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  for(int i=N-1;i>=0;i--){
            ~^~
horses.cpp:24:13: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  for(int i=p+1;i<N;i++){
            ~^~
horses.cpp:30:9: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  return ans;
         ^~~
horses.cpp:16:11: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ll rui=1,p;
           ^

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