Submission #680322

#	Time	Username	Problem	Language	Result	Execution time	Memory
680322		KG07	Cijanobakterije (COCI21_cijanobakterije)	C++14	27 / 70	93 ms	14804 KiB

Main

// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
using namespace std;
vector<int> h[100000];
int a[100000];
bool b[100000];
int c[100000];
pair<int, int> d[100000];
int find(int x){
    if(x == a[x])return x;
    else return a[x] = find(a[x]);
}
queue<pair<int, int>> q;

int main() {
    // Write C++ code here
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= n; i++)a[i] = i;
    for(int i = 0; i < m; i++){
        int u, v;
        cin >> u >> v;
        h[u].push_back(v);
        h[v].push_back(u);
        b[find(u)] = true;
        a[find(u)] = find(v);
    }
    for(int i = 1; i <= n; i++){
        if(b[i])continue;
        d[i] = {i, i};
        for(int j = 0; j < h[i].size(); j++)q.push({h[i][j], i});
        while(!q.empty()){
            int u = q.front().first;
            int v = q.front().second;
            q.pop();
            c[u] = c[v] + 1;
            if(c[u] > c[d[i].first])d[i].first = u;
            for(int j = 0; j < h[u].size(); j++)if(h[u][j] != v)q.push({h[u][j], u});
        }
        c[d[i].first] = 0;
        d[i].second = d[i].first;
        for(int j = 0; j < h[d[i].first].size(); j++)q.push({h[d[i].first][j], d[i].first});
        while(!q.empty()){
            int u = q.front().first;
            int v = q.front().second;
            q.pop();
            c[u] = c[v] + 1;
            if(c[u] > c[d[i].second])d[i].second = u;
            for(int j = 0; j < h[u].size(); j++)if(h[u][j] != v)q.push({h[u][j], u});
        }
    }
    int s = 0;
    for(int i = 1; i <= n; i++){
        //cout << i << " " << a[i] << " " << b[i] << " " << c[i] << " " << c[d[i].first] << " " << c[d[i].second] << "\n";
        if(!b[i])s += c[d[i].second] + 1;
    }
    cout << s;

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:31:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         for(int j = 0; j < h[i].size(); j++)q.push({h[i][j], i});
      |                        ~~^~~~~~~~~~~~~
Main.cpp:38:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |             for(int j = 0; j < h[u].size(); j++)if(h[u][j] != v)q.push({h[u][j], u});
      |                            ~~^~~~~~~~~~~~~
Main.cpp:42:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         for(int j = 0; j < h[d[i].first].size(); j++)q.push({h[d[i].first][j], d[i].first});
      |                        ~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:49:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |             for(int j = 0; j < h[u].size(); j++)if(h[u][j] != v)q.push({h[u][j], u});
      |                            ~~^~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 6 / 6
• Subtask 3: 6 / 6
• Subtask 4: 15 / 15
• Subtask 5: 0 / 28