Submission #933317

#	Time	Username	Problem	Language	Result	Execution time	Memory
933317		SmuggingSpun	Game (IOI14_game)	C++14	100 / 100	276 ms	26456 KiB

game

#include "game.h"
#include<bits/stdc++.h>
using namespace std;
const int lim = 1505;
int n, p[lim], sz[lim], cnt[lim][lim];
int find_set(int n){
	return n == p[n] ? n : p[n] = find_set(p[n]);
}
void merge(int a, int b){
	if(sz[a = find_set(a)] < sz[b = find_set(b)]){
		swap(a, b);
	}
	sz[p[b] = a] += sz[b]; 
	for(int i = 0; i < n; i++){
		cnt[a][i] += cnt[b][i];
		cnt[i][a] += cnt[b][i];
 	}
}
void initialize(int N){
	iota(p, p + (n = N), 0);
	fill(sz, sz + n, 1);
	memset(cnt, 0, sizeof(cnt));
}
int hasEdge(int u, int v){
	if(sz[u = find_set(u)] * sz[v = find_set(v)] - 1 == cnt[u][v]){
		merge(u, v);
		return 1;
	}
	cnt[u][v]++;
	cnt[v][u]++;
	return 0;
}

Compilation message (stderr)

game.cpp: In function 'int hasEdge(int, int)':
game.cpp:25:32: warning: operation on 'v' may be undefined [-Wsequence-point]
   25 |  if(sz[u = find_set(u)] * sz[v = find_set(v)] - 1 == cnt[u][v]){
      |                              ~~^~~~~~~~~~~~~
game.cpp:25:32: warning: operation on 'v' may be undefined [-Wsequence-point]
game.cpp:25:10: warning: operation on 'u' may be undefined [-Wsequence-point]
   25 |  if(sz[u = find_set(u)] * sz[v = find_set(v)] - 1 == cnt[u][v]){
      |        ~~^~~~~~~~~~~~~
game.cpp:25:10: warning: operation on 'u' may be undefined [-Wsequence-point]

• Subtask 1: 15 / 15
• Subtask 2: 27 / 27
• Subtask 3: 58 / 58