Submission #404176

#	Time	Username	Problem	Language	Result	Execution time	Memory
404176		ly20	Friend (IOI14_friend)	C++17	0 / 100	1 ms	332 KiB

friend

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

const int MAXN = 1123;
int val[MAXN], marc[MAXN];
vector <int> grafo[MAXN];
// Find out best sample
int ld[MAXN], mtc[MAXN];
void dfs(int v) {
    for(int i = 0; i < grafo[v].size(); i++) {
        int viz = grafo[v][i];
        if(ld[viz] != -1) continue;
        ld[viz] = 1 - ld[v];
        dfs(viz);
    }
}
bool dfs1(int v) {
    for(int i = 0; i < grafo[v].size(); i++) {
        int viz = grafo[v][i];
        if(marc[viz] == 1) continue;
        marc[viz] = 1;
        if(mtc[viz] < 0 || dfs1(mtc[viz])) {
            mtc[viz] = v;
            mtc[v] = viz;
            return true;
        }
    }
    return false;
}
int findSample(int n,int confidence[],int host[],int protocol[]){
    for(int i = 0; i < n; i++) {
        val[i] = confidence[i];
        ld[i] = -1;
        mtc[i] = -1;
    }
    for(int i = 1; i < n; i++) {
        int cur = host[i];
        if(protocol[i] == 0) {
            grafo[i].push_back(cur);
            grafo[cur].push_back(i);
        }
        else {
            for(int j = 0; j < grafo[cur].size(); j++) {
                int viz = grafo[cur][j];
                grafo[viz].push_back(i);
                grafo[i].push_back(viz);
            }
        }
    }
    for(int i = 0; i < n; i++) {
        if(ld[i] == -1) {
            ld[i] = 0;
            dfs(i);
        }
    }
    bool aux = true;
    int resp = 0;
    while(aux) {
        for(int i = 0; i < n; i++) {
            marc[i] = 0;
        }
        aux = false;
        for(int i = 0; i < n; i++) {
            if(ld[i] == 1) continue;
            if(dfs1(i)) {
                resp++;
                aux = true;
            }
        }
    }
    return n - resp;
}

Compilation message (stderr)

friend.cpp: In function 'void dfs(int)':
friend.cpp:11:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int i = 0; i < grafo[v].size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~
friend.cpp: In function 'bool dfs1(int)':
friend.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i = 0; i < grafo[v].size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~
friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:44:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |             for(int j = 0; j < grafo[cur].size(); j++) {
      |                            ~~^~~~~~~~~~~~~~~~~~~

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