Submission #23704

#	Time	Username	Problem	Language	Result	Execution time	Memory
23704		Hiasat	Friend (IOI14_friend)	C++14	23 / 100	0 ms	3360 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>

using namespace std;

vector<int> adj[1002];

int c[1002],vis[1001],vsId,match[1001];

vector<int> fv[2];


void dfs(int u , int color){
	if(c[u] != -1){
		assert(c[u] == color);
		return;
	}
	c[u] = color;
	fv[color].push_back(u);
	for (int i = 0; i < adj[u].size(); ++i){
		dfs(adj[u][i],!color);
	}
}
bool findMatch(int u){
	vis[u] = vsId;
	for (int i = 0; i < adj[u].size(); ++i){
		int v = adj[u][i];
		if(match[v] == -1 || vis[match[v]] != vsId && findMatch(match[v])){			
			match[v] = u;
			return true;
		}
	}
	return false;
}
int findSample(int n,int confidence[],int host[],int protocol[]){
	memset(c,-1,sizeof c);
	for(int i = 1 ; i <= n-1; i++){
		if(protocol[i] == 0){
			adj[host[i]].push_back(i);
			adj[i].push_back(host[i]);
		}
		if(protocol[i] == 1){
			for(int j = 0 ; j < adj[host[i]].size();j++){
				int v = adj[host[i]][j];
				adj[v].push_back(i);
				adj[i].push_back(v);
			}
		}
	}	
	memset(match,-1,sizeof match);
	int ans = 0;
	for (int i = 0; i < n; ++i){
		if(c[i] != -1)
			continue;
		dfs(i,0);
		int cur = 0;
		for(int j = 0 ; j < fv[0].size();j++){
			int v = fv[0][j];
			vsId++;
			if(findMatch(v))
				cur++;
		}
		ans += cur;
		fv[0].clear();
		fv[1].clear();
	}
	return n-ans;
}

Compilation message (stderr)

friend.cpp: In function 'void dfs(int, int)':
friend.cpp:20:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < adj[u].size(); ++i){
                    ^
friend.cpp: In function 'bool findMatch(int)':
friend.cpp:26:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < adj[u].size(); ++i){
                    ^
friend.cpp:28:46: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(match[v] == -1 || vis[match[v]] != vsId && findMatch(match[v])){   
                                              ^
friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j = 0 ; j < adj[host[i]].size();j++){
                      ^
friend.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j = 0 ; j < fv[0].size();j++){
                     ^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 0 / 19
• Subtask 5: 23 / 23
• Subtask 6: 0 / 31