Submission #428273

#	Time	Username	Problem	Language	Result	Execution time	Memory
428273		haxorman	Horses (IOI15_horses)	C++14	17 / 100	1587 ms	90280 KiB

horses

#include "horses.h"
#include "bits/stdc++.h"
using namespace std;
 
const int mxN = 5e5 + 7;
const int MOD = 1e9 + 7;
 
int n;
long long x[mxN], y[mxN];
map<pair<int,long long>,long long> dp;
 
long long rec(int i, long long horses) {
	horses *= x[i];
	if (i == n - 1) {
		return (y[i] * horses) % MOD;
	}

	if (dp.count({i, horses})) {
		return dp[{i, horses}];
	}
 	
 	long long keep = rec(i + 1, horses);
	long long sell = y[i] * horses;
 	
 	dp[{i, horses}] = max(sell, keep) % MOD;
 	return max(sell, keep) % MOD;
}
 
int init(int N, int X[], int Y[]) {
	n = N;
	for (int i = 0; i < n; ++i) {
		x[i] = X[i];
		y[i] = Y[i];
	}
	return rec(0, 1);
}
 
int updateX(int pos, int val) {
	dp.clear();
	x[pos] = val;
	return rec(0, 1);
}
 
int updateY(int pos, int val) {
	dp.clear();
	y[pos] = val;
	return rec(0, 1);
}

Compilation message (stderr)

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:35:12: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   35 |  return rec(0, 1);
      |         ~~~^~~~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:41:12: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   41 |  return rec(0, 1);
      |         ~~~^~~~~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:47:12: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   47 |  return rec(0, 1);
      |         ~~~^~~~~~

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