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Submission #130451

# Submission time Handle Problem Language Result Execution time Memory
130451 2019-07-15T08:25:08 Z mirbek01 Simurgh (IOI17_simurgh) C++11
30 / 100
 196 ms 3152 KB 
#include "simurgh.h"
//#include "grader.cpp"
#include <bits/stdc++.h>

using namespace std;

const int N = 3e4 + 2;

int p[N], sz[N], used[N];
vector <int> g[N];

int f_s(int v){
    return (p[v] == v)?v:p[v] = f_s(p[v]);
}

void u_s(int a, int b){
    a = f_s(a);
    b = f_s(b);
    if(a != b){
        if(sz[a] < sz[b])
            swap(a, b);
        p[b] = a;
        sz[a] += sz[b];
    }
}

int tin[N], tout[N], timer;

void dfs(int v, int pr){
    tin[v] = ++ timer;
    for(int to : g[v]){
        if(to == pr)
            continue;
        dfs(to, v);
    }
    tout[v] = timer;
}

bool upper(int a, int b){
    return tin[a] <= tin[b] && tout[a] >= tout[b];
}

vector<int> find_roads(int n, vector<int> u, vector<int> v) {
      vector<int> r(n - 1);
      int m = (int)u.size();
      for(int i = 0; i < n; i ++)
            p[i] = i, sz[i] = 1;
      int pt = 0;
      for(int i = 0; i < m; i ++){
            if(f_s(u[i]) != f_s(v[i])){
                  r[pt ++] = i;
                  u_s(u[i], v[i]);
                  g[u[i]].push_back(v[i]);
                  g[v[i]].push_back(u[i]);
            }
      }
      dfs(0, 0);
      for(int i = 0; i < pt; i ++){
            vector <int> ind, rs;
            int a = u[ r[i] ], b = v[ r[i] ];
            if(upper(b, a))
                  swap(a, b);
            for(int j = 0; j < m; j ++){
                  int cnt = 0;
                  if(upper(b, u[j]))
                        cnt ++;
                  if(upper(b, v[j]))
                        cnt ++;
                  if(cnt == 1)
                        ind.push_back(j);
            }
            int mx = 0;
            for(int j = 0; j < ind.size(); j ++){
                  int id = ind[j], pre = r[i];
                  r[i] = id;
                  int ret = count_common_roads(r);
                  mx = max(mx, ret);
                  r[i] = pre;
                  rs.emplace_back(ret);
            }
            for(int j = 0; j < rs.size(); j ++){
                  if(rs[j] == mx){
                        used[ ind[j] ] = 2;
                  }
            }
      }
      pt = 0;
      for(int i = 0; i < m; i ++){
            if(used[i] == 2)
                  r[pt ++] = i;
      }
      return r;
}

Compilation message

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:73:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < ind.size(); j ++){
                            ~~^~~~~~~~~~~~
simurgh.cpp:81:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < rs.size(); j ++){
                            ~~^~~~~~~~~~~

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1076 KB correct
2 Correct 3 ms 1216 KB correct
3 Correct 3 ms 1072 KB correct
4 Correct 3 ms 1108 KB correct
5 Correct 3 ms 1076 KB correct
6 Correct 3 ms 1016 KB correct
7 Correct 3 ms 1020 KB correct
8 Correct 2 ms 1016 KB correct
9 Correct 3 ms 1104 KB correct
10 Correct 2 ms 1016 KB correct
11 Correct 3 ms 1076 KB correct
12 Correct 3 ms 1076 KB correct
13 Correct 3 ms 1016 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1076 KB correct
2 Correct 3 ms 1216 KB correct
3 Correct 3 ms 1072 KB correct
4 Correct 3 ms 1108 KB correct
5 Correct 3 ms 1076 KB correct
6 Correct 3 ms 1016 KB correct
7 Correct 3 ms 1020 KB correct
8 Correct 2 ms 1016 KB correct
9 Correct 3 ms 1104 KB correct
10 Correct 2 ms 1016 KB correct
11 Correct 3 ms 1076 KB correct
12 Correct 3 ms 1076 KB correct
13 Correct 3 ms 1016 KB correct
14 Correct 15 ms 1016 KB correct
15 Correct 13 ms 1016 KB correct
16 Correct 12 ms 1116 KB correct
17 Correct 11 ms 1112 KB correct
18 Correct 6 ms 1112 KB correct
19 Correct 12 ms 1016 KB correct
20 Correct 13 ms 1120 KB correct
21 Correct 9 ms 1016 KB correct
22 Correct 7 ms 1076 KB correct
23 Correct 7 ms 1016 KB correct
24 Correct 6 ms 1076 KB correct
25 Correct 3 ms 1064 KB correct
26 Correct 7 ms 1080 KB correct
27 Correct 7 ms 1016 KB correct
28 Correct 4 ms 1016 KB correct
29 Correct 3 ms 1016 KB correct
30 Correct 8 ms 1116 KB correct
31 Correct 9 ms 1076 KB correct
32 Correct 9 ms 1084 KB correct
33 Correct 8 ms 1016 KB correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1076 KB correct
2 Correct 3 ms 1216 KB correct
3 Correct 3 ms 1072 KB correct
4 Correct 3 ms 1108 KB correct
5 Correct 3 ms 1076 KB correct
6 Correct 3 ms 1016 KB correct
7 Correct 3 ms 1020 KB correct
8 Correct 2 ms 1016 KB correct
9 Correct 3 ms 1104 KB correct
10 Correct 2 ms 1016 KB correct
11 Correct 3 ms 1076 KB correct
12 Correct 3 ms 1076 KB correct
13 Correct 3 ms 1016 KB correct
14 Correct 15 ms 1016 KB correct
15 Correct 13 ms 1016 KB correct
16 Correct 12 ms 1116 KB correct
17 Correct 11 ms 1112 KB correct
18 Correct 6 ms 1112 KB correct
19 Correct 12 ms 1016 KB correct
20 Correct 13 ms 1120 KB correct
21 Correct 9 ms 1016 KB correct
22 Correct 7 ms 1076 KB correct
23 Correct 7 ms 1016 KB correct
24 Correct 6 ms 1076 KB correct
25 Correct 3 ms 1064 KB correct
26 Correct 7 ms 1080 KB correct
27 Correct 7 ms 1016 KB correct
28 Correct 4 ms 1016 KB correct
29 Correct 3 ms 1016 KB correct
30 Correct 8 ms 1116 KB correct
31 Correct 9 ms 1076 KB correct
32 Correct 9 ms 1084 KB correct
33 Correct 8 ms 1016 KB correct
34 Incorrect 196 ms 2012 KB WA in grader: NO
35 Halted 0 ms 0 KB -

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1076 KB correct
2 Correct 3 ms 1016 KB correct
3 Incorrect 155 ms 3152 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1076 KB correct
2 Correct 3 ms 1216 KB correct
3 Correct 3 ms 1072 KB correct
4 Correct 3 ms 1108 KB correct
5 Correct 3 ms 1076 KB correct
6 Correct 3 ms 1016 KB correct
7 Correct 3 ms 1020 KB correct
8 Correct 2 ms 1016 KB correct
9 Correct 3 ms 1104 KB correct
10 Correct 2 ms 1016 KB correct
11 Correct 3 ms 1076 KB correct
12 Correct 3 ms 1076 KB correct
13 Correct 3 ms 1016 KB correct
14 Correct 15 ms 1016 KB correct
15 Correct 13 ms 1016 KB correct
16 Correct 12 ms 1116 KB correct
17 Correct 11 ms 1112 KB correct
18 Correct 6 ms 1112 KB correct
19 Correct 12 ms 1016 KB correct
20 Correct 13 ms 1120 KB correct
21 Correct 9 ms 1016 KB correct
22 Correct 7 ms 1076 KB correct
23 Correct 7 ms 1016 KB correct
24 Correct 6 ms 1076 KB correct
25 Correct 3 ms 1064 KB correct
26 Correct 7 ms 1080 KB correct
27 Correct 7 ms 1016 KB correct
28 Correct 4 ms 1016 KB correct
29 Correct 3 ms 1016 KB correct
30 Correct 8 ms 1116 KB correct
31 Correct 9 ms 1076 KB correct
32 Correct 9 ms 1084 KB correct
33 Correct 8 ms 1016 KB correct
34 Incorrect 196 ms 2012 KB WA in grader: NO
35 Halted 0 ms 0 KB -