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Submission #59290

# Submission time Handle Problem Language Result Execution time Memory
59290 2018-07-21T12:01:46 Z gabrielsimoes Duathlon (APIO18_duathlon) C++17
0 / 100
 170 ms 23828 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
const int MAXN = 1e5+10;
const int MAXM = 2e5+10;

int n, m;
vector<int> g[MAXN];
ll sub[MAXN];

void dfs0(int cur, int pre) {
    sub[cur] = 1;
    for (int nx : g[cur]) {
        if (nx != pre) {
            dfs0(nx, cur);
            sub[cur] += sub[nx];
        }
    }
}

ll ans = 0;
void dfs1(int cur, int pre, ll sum = 0) {
    ans += 2 * sum * (sub[cur]-1);

    // printf("dfs1 %d %lld %lld: ans %lld\n", cur, sum, sub[cur], ans);

    for (int nx : g[cur]) {
        if (nx != pre) {
            ans += (sub[cur]-1-sub[nx]) * sub[nx];
            dfs1(nx, cur, sum + sub[cur] - sub[nx]);
            // printf("dfs1 %d: ans %lld\n", cur, ans);
        }
    }
}

int main() {
    scanf("%d%d", &n, &m);

    assert(m == n-1);

    for (int i = 0,a,b; i < m; i++) {
        scanf("%d%d", &a, &b);
        g[a].push_back(b);
        g[b].push_back(a);
    }

    dfs0(1, 1);
    dfs1(1, 1);

    printf("%lld\n", ans);
}

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
count_triplets.cpp:43:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Runtime error 8 ms 5240 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Runtime error 8 ms 5240 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 11 ms 5352 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5432 KB Output is correct
2 Correct 5 ms 5564 KB Output is correct
3 Correct 6 ms 5700 KB Output is correct
4 Correct 6 ms 5776 KB Output is correct
5 Correct 7 ms 5908 KB Output is correct
6 Correct 6 ms 5908 KB Output is correct
7 Correct 6 ms 5908 KB Output is correct
8 Correct 6 ms 5908 KB Output is correct
9 Correct 5 ms 5908 KB Output is correct
10 Runtime error 11 ms 5908 KB Execution killed with signal 11 (could be triggered by violating memory limits)
11 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 11124 KB Output is correct
2 Correct 164 ms 12440 KB Output is correct
3 Correct 119 ms 13576 KB Output is correct
4 Correct 100 ms 14752 KB Output is correct
5 Correct 102 ms 16068 KB Output is correct
6 Correct 145 ms 20712 KB Output is correct
7 Correct 170 ms 20740 KB Output is correct
8 Correct 144 ms 21552 KB Output is correct
9 Correct 169 ms 22212 KB Output is correct
10 Runtime error 9 ms 22212 KB Execution killed with signal 11 (could be triggered by violating memory limits)
11 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 22212 KB Output is correct
2 Correct 5 ms 22212 KB Output is correct
3 Runtime error 9 ms 22212 KB Execution killed with signal 11 (could be triggered by violating memory limits)
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 139 ms 22512 KB Output is correct
2 Correct 135 ms 23828 KB Output is correct
3 Runtime error 10 ms 23828 KB Execution killed with signal 11 (could be triggered by violating memory limits)
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Runtime error 8 ms 5240 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 8 ms 5240 KB Execution killed with signal 11 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -