Submission #40047

#	Time	Username	Problem	Language	Result	Execution time	Memory
40047		igzi	Horses (IOI15_horses)	C++14	17 / 100	53 ms	47600 KiB

horses

#include <bits/stdc++.h>
#include "horses.h"
#define maxN 500005
#define mod 1000000007

using namespace std;

struct segment{
long long a,b;};
segment seg[4*maxN];
vector <long long> x,y;

void build(int n,int l,int d){
if(l==d){
    seg[n].a=x[l];
    seg[n].b=(x[l]*y[l])%mod;
}
else{
    int m=(l+d)/2;
    build(2*n,l,m);
    build(2*n+1,m+1,d);
    seg[n].a=(seg[2*n].a*seg[2*n+1].a)%mod;
    seg[n].b=(max(seg[2*n].b,seg[2*n+1].b*seg[2*n].a))%mod;
}
}
void updatex(int n,int l,int d,int p,int v){
if(l==d){
    x[l]=v;
    seg[n].a=x[l];
    seg[n].b=(x[l]*y[l])%mod;
}
else{
    int m=(l+d)/2;
    if(p<=m) updatex(2*n,l,m,p,v);
    else updatex(2*n+1,m+1,d,p,v);
    seg[n].a=(seg[2*n].a*seg[2*n+1].a)%mod;
    seg[n].b=(max(seg[2*n].b,seg[2*n+1].b*seg[2*n].a))%mod;
}
}
void updatey(int n,int l,int d,int p,int v){
if(l==d){
    y[l]=v;
    seg[n].a=x[l];
    seg[n].b=(x[l]*y[l])%mod;
}
else{
    int m=(l+d)/2;
    if(p<=m) updatey(2*n,l,m,p,v);
    else updatey(2*n+1,m+1,d,p,v);
    seg[n].a=(seg[2*n].a*seg[2*n+1].a)%mod;
    seg[n].b=(max(seg[2*n].b,seg[2*n+1].b*seg[2*n].a))%mod;
}
}

int init(int n,int a[],int b[]){
int i;
for(i=0;i<n;i++){
    x.push_back(a[i]%mod);
    y.push_back(b[i]%mod);
}
build(1,0,n-1);
return seg[1].b;
}
int updateX(int pos,int val){
updatex(1,0,x.size()-1,pos,val);
return seg[1].b;
}
int updateY(int pos,int val){
updatey(1,0,y.size()-1,pos,val);
return seg[1].b;
}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:62:15: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
 return seg[1].b;
               ^
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:65:31: warning: conversion to 'int' from 'std::vector<long long int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
 updatex(1,0,x.size()-1,pos,val);
                               ^
horses.cpp:66:15: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
 return seg[1].b;
               ^
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:69:31: warning: conversion to 'int' from 'std::vector<long long int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
 updatey(1,0,y.size()-1,pos,val);
                               ^
horses.cpp:70:15: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
 return seg[1].b;
               ^

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