Submission #404154

#	Time	Username	Problem	Language	Result	Execution time	Memory
404154		ly20	Friend (IOI14_friend)	C++17	0 / 100	65 ms	25448 KiB

friend

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

const int MAXN = 1123;
int marc[MAXN];
int val[MAXN];
vector <int> grafo[MAXN];
// Find out best sample
int br, pt;
void dfs(int v) {
    if(marc[v] == 0) br += val[v];
    else pt += val[v];
    for(int i = 0; i < grafo[v].size(); i++) {
        int viz = grafo[v][i];
        if(marc[viz] != -1) {
            continue;
        }
        marc[viz] = 1 - marc[v];
        dfs(viz);
    }
}
int dp[MAXN][2];
int findSample(int n,int confidence[],int host[],int protocol[]){
    int tot = 0;
    int mx = 0;
    for(int i = 0; i < n; i++) {
        marc[i] = -1;
        val[i] = confidence[i];
        mx = max(mx, val[i]);
    }
    for(int i = 1; i < n - 1; i++) {
        int cur = host[i];
        if(protocol[i] == 0 || protocol[i] == 2) {
           grafo[i].push_back(cur);
           grafo[cur].push_back(i);
        }
        if(protocol[i] == 1 || protocol[i] == 2) {
            for(int j = 0; j < grafo[cur].size(); j++) {
                int viz = grafo[cur][j];
                grafo[i].push_back(viz);
                grafo[viz].push_back(i);
            }
        }
    }
    int resp = 0;
    for(int i = 0; i < n; i++) {
        if(marc[i] == -1) {
            br = 0; pt = 0;
            marc[i] = 0;
            dfs(i);
            resp += max(br, pt);
            tot += br + pt;
        }
    }
    dp[0][1] = val[0];
	dp[0][0] = 0;
	for(int i = 1; i < n; i++) {
        dp[i][0] = max(dp[i - 1][0] , dp[i - 1][1]);
        dp[i][1] = dp[i - 1][0] + val[i];
	}
	return max(dp[n - 1][0], dp[n - 1][1]);
}

Compilation message (stderr)

friend.cpp: In function 'void dfs(int)':
friend.cpp:14:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i = 0; i < grafo[v].size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~
friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:39:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |             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