Submission #139548

#	Time	Username	Problem	Language	Result	Execution time	Memory
139548		Plurm	Horses (IOI15_horses)	C++11	17 / 100	671 ms	42636 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>
using namespace std;

multiset<int> mm;
const int MOD = 1e9+7;
long double FT1[500005];
int FT2[500005];
void add(int idx, int amt){
    idx++;
    while(idx < 500005){
        FT1[idx] += log2(amt);
        FT2[idx] = (1ll * FT2[idx] * amt) % MOD;
        idx += idx & -idx;
    }
}
long double sum1(int idx){
    idx++;
    long double ret = 0;
    while(idx > 0){
        ret += FT1[idx];
        idx -= idx & -idx;
    }
    return ret;
}
int sum2(int idx){
    idx++;
    int ret = 1;
    while(idx > 0){
        ret = (1ll * ret * FT2[idx]) % MOD;
        idx -= idx & -idx;
    }
    return ret;
}
int rx[500005];
int ry[500005];

int answer(){
    return *mm.rbegin();
}

int init(int N, int X[], int Y[]) {
    for(int i = 0; i < N; i++){
        rx[i] = X[i];
        ry[i] = Y[i];
    }
    for(int i = 0; i < 500005; i++) FT2[i] = 1;
    for(int i = 0; i < N; i++){
        add(i, X[i]);
    }
    for(int i = 0; i < N; i++){
        mm.emplace((int)((1ll * sum2(i) * ry[i]) % MOD));
    }
	return answer();
}

int updateX(int pos, int val) {
    mm.erase(mm.find((int)((1ll * sum2(pos) * ry[pos]) % MOD)));
    add(pos, val - rx[pos]);
    rx[pos] = val;
    mm.emplace((int)((1ll * sum2(pos) * ry[pos]) % MOD));
	return answer();
}

int updateY(int pos, int val) {
    mm.erase(mm.find((int)((1ll * sum2(pos) * ry[pos]) % MOD)));
    ry[pos] = val;
    mm.emplace((int)((1ll * sum2(pos) * ry[pos]) % MOD));
	return answer();
}

Compilation message (stderr)

horses.cpp: In function 'void add(int, int)':
horses.cpp:13:43: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         FT2[idx] = (1ll * FT2[idx] * amt) % MOD;
                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int sum2(int)':
horses.cpp:30:38: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         ret = (1ll * ret * FT2[idx]) % MOD;
               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~

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