제출 #719446

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
719446		thimote75	말 (IOI15_horses)	C++14	17 / 100	1560 ms	27740 KiB

horses

#include "horses.h"

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

#define ld long double
#define num long long

const num MOD = 1e9 + 7;

vector<num> X;
vector<num> Y;
vector<ld> lX;
vector<ld> lY;

int compute () {
	ld max_v = 0;
	ld sum_v = 0;

	num prod_v = 1;
	num mx_p_v = 0;

	for (int j = 0; j < lX.size(); j ++) {
		sum_v  += lX[j];
		ld cur_v = sum_v + lY[j];

		prod_v *= X[j];
		prod_v %= MOD;

		if (cur_v > max_v) {
			max_v = cur_v;

			mx_p_v = (prod_v * Y[j]) % MOD;
		}
	}

	return (int) round(exp(max_v));
}

int init(int N, int _X[], int _Y[]) {
	X.resize(N);
	Y.resize(N);
	lX.resize(N);
	lY.resize(N);

	for (int i = 0; i < N; i ++) {
		X [i] = _X[i];
		Y [i] = _Y[i];
		lX[i] = log((ld) _X[i]);
		lY[i] = log((ld) _Y[i]);
	}

	return compute();
}

int updateX(int pos, int val) {
	X [pos] = val;
	lX[pos] = log((ld) val);
	return compute();
}

int updateY(int pos, int val) {
	Y [pos] = val;
	lY[pos] = log((ld) val);
	return compute();
}

컴파일 시 표준 에러 (stderr) 메시지

horses.cpp: In function 'int compute()':
horses.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long double>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for (int j = 0; j < lX.size(); j ++) {
      |                  ~~^~~~~~~~~~~
horses.cpp:21:6: warning: variable 'mx_p_v' set but not used [-Wunused-but-set-variable]
   21 |  num mx_p_v = 0;
      |      ^~~~~~

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