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Submission #155126

# Submission time Handle Problem Language Result Execution time Memory
155126 2019-09-26T13:47:46 Z Akashi Duathlon (APIO18_duathlon) C++14
8 / 100
 210 ms 28380 KB 
#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>
using namespace std;

int n, m, nrc;
bool viz[100005];
int id[100005], h[100005], low[100005];
vector <int> v[100005];
set <int> v2[100005];
vector <int> ctc[100005];
stack <int> st;

void dfs(int nod, int papa = 0){
    st.push(nod);
    viz[nod] = 1;

    for(auto it : v[nod]){
        if(papa == it) continue ;

        if(!viz[it]){
            h[it] = low[it] = h[nod] + 1;
            dfs(it, nod);
            low[nod] = min(low[nod], low[it]);
        }
        else low[nod] = min(low[nod], low[it]);
    }

    if(low[nod] == h[nod]){
        int x;
        ++nrc;
        do{
            x = st.top();
            st.pop();

            id[x] = nrc;
            ctc[nrc].push_back(x);
        }while(x != nod);
    }
}

long long Sol1 = 0;
long long Sol2 = 0;
long long dp[100005][2];

void ctc_dfs(int nod){
    viz[nod] = 1;

    int sz = ctc[nod].size();
    Sol2 = Sol2 + 1LL * sz * (sz - 1) * (sz - 2);

    dp[nod][0] = sz;
    dp[nod][1] = 1LL * (sz - 1) * (sz - 1);

    for(auto it : v2[nod]){
        if(viz[it]) continue ;

        ctc_dfs(it);

        dp[nod][0] += dp[it][0];
        dp[nod][1] = dp[nod][1] + dp[it][1] + 1LL * sz * dp[it][0];

        Sol1 = Sol1 + sz * dp[it][1] + 1LL * (sz - 1) * (sz - 1) * dp[it][0];
    }
}

int main()
{
//    freopen("1.in", "r", stdin);
//    freopen("1.out", "w", stdout);
    scanf("%d%d", &n, &m);

    int x, y;
    for(int i = 1; i <= m ; ++i){
        scanf("%d%d", &x, &y);

        v[x].push_back(y);
        v[y].push_back(x);
    }

    for(int i = 1; i <= n ; ++i){
        if(viz[i]) continue ;
        dfs(i);
    }

    for(int i = 1; i <= nrc ; ++i){
        for(auto nod : ctc[i]){
            for(auto it : v[nod]){
                if(id[it] != id[nod])
                    v2[i].insert(id[it]);
            }
        }
    }

    memset(viz, 0, sizeof(viz));
    for(int i = 1; i <= nrc ; ++i){
        if(viz[i]) continue ;
        ctc_dfs(i);
    }

    printf("%lld", Sol1 * 2LL + Sol2);

    return 0;
}

Compilation message

count_triplets.cpp: In function 'int main()':
count_triplets.cpp:70:10: 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:74:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &x, &y);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 9848 KB Output is correct
2 Correct 10 ms 9848 KB Output is correct
3 Correct 11 ms 9848 KB Output is correct
4 Correct 11 ms 9848 KB Output is correct
5 Correct 11 ms 9848 KB Output is correct
6 Correct 11 ms 9848 KB Output is correct
7 Incorrect 11 ms 9848 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 9848 KB Output is correct
2 Correct 10 ms 9848 KB Output is correct
3 Correct 11 ms 9848 KB Output is correct
4 Correct 11 ms 9848 KB Output is correct
5 Correct 11 ms 9848 KB Output is correct
6 Correct 11 ms 9848 KB Output is correct
7 Incorrect 11 ms 9848 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 24440 KB Output is correct
2 Correct 98 ms 24512 KB Output is correct
3 Correct 119 ms 26268 KB Output is correct
4 Correct 123 ms 25100 KB Output is correct
5 Correct 109 ms 22352 KB Output is correct
6 Correct 124 ms 25716 KB Output is correct
7 Correct 139 ms 24808 KB Output is correct
8 Correct 164 ms 25392 KB Output is correct
9 Correct 130 ms 23884 KB Output is correct
10 Correct 146 ms 23276 KB Output is correct
11 Correct 117 ms 20856 KB Output is correct
12 Correct 121 ms 20916 KB Output is correct
13 Correct 111 ms 20956 KB Output is correct
14 Correct 118 ms 20792 KB Output is correct
15 Correct 130 ms 20700 KB Output is correct
16 Correct 94 ms 20308 KB Output is correct
17 Correct 23 ms 15608 KB Output is correct
18 Correct 28 ms 15580 KB Output is correct
19 Correct 27 ms 15608 KB Output is correct
20 Correct 26 ms 15608 KB Output is correct
21 Correct 26 ms 15480 KB Output is correct
22 Correct 26 ms 15480 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 9976 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 169 ms 28380 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 12 ms 10048 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 210 ms 28280 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 9848 KB Output is correct
2 Correct 10 ms 9848 KB Output is correct
3 Correct 11 ms 9848 KB Output is correct
4 Correct 11 ms 9848 KB Output is correct
5 Correct 11 ms 9848 KB Output is correct
6 Correct 11 ms 9848 KB Output is correct
7 Incorrect 11 ms 9848 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 9848 KB Output is correct
2 Correct 10 ms 9848 KB Output is correct
3 Correct 11 ms 9848 KB Output is correct
4 Correct 11 ms 9848 KB Output is correct
5 Correct 11 ms 9848 KB Output is correct
6 Correct 11 ms 9848 KB Output is correct
7 Incorrect 11 ms 9848 KB Output isn't correct
8 Halted 0 ms 0 KB -