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Submission #647076

# Submission time Handle Problem Language Result Execution time Memory
647076 2022-10-01T14:23:41 Z Alma Cijanobakterije (COCI21_cijanobakterije) C++14
70 / 70
 50 ms 7500 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
using ll = long long;
using ii = pair<int,int>;

const int INF = 1e9;
const ll LLINF = 1e18;
using vi = vector<int>;
using vvi = vector<vi>;

void setIO (string fileName) {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    if (fileName != "std") {
        freopen((fileName + ".in").c_str(), "r", stdin);
        freopen((fileName + ".out").c_str(), "w", stdout);
    }
}

int treeDiameter (vvi& adj, vi& vis, int idx) {
	int last = idx, dist = 1;
	queue<ii> bfs;
	bfs.push({idx, -1});
	while (!bfs.empty()) {
		int u = bfs.front().fi;
		int p = bfs.front().se;
		bfs.pop();
		last = u;
		for (int v: adj[u]) {
			if (v != p) bfs.push({v, u});
		}
	}
	bfs.push({last, 1});
	while (!bfs.empty()) {
		int u = bfs.front().fi;
		int d = bfs.front().se;
		bfs.pop();
		dist = d;
		vis[u] = true;
		for (int v: adj[u]) {
			if (!vis[v]) bfs.push({v, d+1});
		}
	}
	return dist;
}

int main() {
    setIO("std");

    int n, m, u, v;
	cin >> n >> m;
	vvi adj(n);
	vi vis(n, false);

	while (m--) {
		cin >> u >> v;
		u--; v--;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}

	int ans = 0;
	for (int i = 0; i < n; i++) {
		if (!vis[i]) {
			ans += treeDiameter(adj, vis, i);
		}
	}
	cout << ans << '\n';

    return 0;
}

Compilation message

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen((fileName + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen((fileName + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 1492 KB Output is correct
2 Correct 15 ms 2700 KB Output is correct
3 Correct 20 ms 3924 KB Output is correct
4 Correct 27 ms 5100 KB Output is correct
5 Correct 40 ms 6348 KB Output is correct
6 Correct 38 ms 7500 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 7268 KB Output is correct
2 Correct 4 ms 1228 KB Output is correct
3 Correct 10 ms 2172 KB Output is correct
4 Correct 11 ms 3156 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 4 ms 1404 KB Output is correct
6 Correct 8 ms 2636 KB Output is correct
7 Correct 12 ms 3836 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 320 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct

Subtask #5
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 1492 KB Output is correct
2 Correct 15 ms 2700 KB Output is correct
3 Correct 20 ms 3924 KB Output is correct
4 Correct 27 ms 5100 KB Output is correct
5 Correct 40 ms 6348 KB Output is correct
6 Correct 38 ms 7500 KB Output is correct
7 Correct 32 ms 7268 KB Output is correct
8 Correct 4 ms 1228 KB Output is correct
9 Correct 10 ms 2172 KB Output is correct
10 Correct 11 ms 3156 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 320 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 4 ms 1404 KB Output is correct
16 Correct 8 ms 2636 KB Output is correct
17 Correct 12 ms 3836 KB Output is correct
18 Correct 1 ms 320 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 320 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 1 ms 340 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 340 KB Output is correct
28 Correct 1 ms 340 KB Output is correct
29 Correct 50 ms 7448 KB Output is correct
30 Correct 18 ms 4052 KB Output is correct
31 Correct 35 ms 6932 KB Output is correct
32 Correct 26 ms 4936 KB Output is correct
33 Correct 44 ms 7244 KB Output is correct
34 Correct 25 ms 5568 KB Output is correct
35 Correct 35 ms 7048 KB Output is correct
36 Correct 37 ms 6088 KB Output is correct
37 Correct 46 ms 7120 KB Output is correct
38 Correct 46 ms 6668 KB Output is correct
39 Correct 34 ms 6988 KB Output is correct