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Submission #54971

# Submission time Handle Problem Language Result Execution time Memory
54971 2018-07-05T15:20:45 Z kdh9949 Pipes (CEOI15_pipes) C++17
0 / 100
 1482 ms 8952 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 100001, H = 17;

int n, m, p[N], P[N], c[N], d[N], s[N];
vector<int> e[N];

int f(int x){ return p[x] = (x == p[x] ? x : f(p[x])); }
int F(int x){ return P[x] = (x == P[x] ? x : F(P[x])); }

void g(int x, int y, int z){
    s[x] = y; d[x] = z;
    for(int i : e[x]) if(i != y) g(i, x, z + 1);
}

int main(){
    scanf("%d%d", &n, &m);
    iota(p, p + n + 1, 0);
    iota(P, P + n + 1, 0);
    iota(s, s + n + 1, 0);
    fill(c + 1, c + n + 1, 1);
    for(int x, y; m--; ){
        scanf("%d%d", &x, &y);
        if(f(x) != f(y)){
            if(c[f(x)] < c[f(y)]) swap(x, y);
            e[x].push_back(y); e[y].push_back(x);
            g(y, x, d[x] + 1);
            c[f(x)] += c[f(y)]; p[f(y)] = f(x);
        }
        else{
            x = F(x); y = F(y);/*
            while(x != y){
                if(d[x] > d[y]){ P[x] = F(P[s[x]]); x = F(x); }
                else{ P[y] = F(P[s[y]]); y = F(y); }
            }*/
        }
    }
    for(int i = 1; i <= n; i++) if(P[i] == i && s[i] != i) printf("%d %d\n", i, s[i]);
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
pipes.cpp:24:14: 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 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 2688 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 2944 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 113 ms 2936 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 197 ms 3212 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 336 ms 4188 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 556 ms 7060 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 695 ms 7644 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 901 ms 8952 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1229 ms 8924 KB Wrong number of edges
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1482 ms 8580 KB Wrong number of edges
2 Halted 0 ms 0 KB -