oj.uz

Submission #91392

# Submission time Handle Problem Language Result Execution time Memory
91392 2018-12-27T10:28:01 Z mirbek01 Marriage questions (IZhO14_marriage) C++11
78 / 100
 1500 ms 14272 KB 
# include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 2;

int n, m, k, mt[N], used[N], ans, L, R;
vector <int> g[N], vr, mr;

bool dfs(int v){
      if(used[v])
            return 0;
      vr.push_back(v);
      used[v] = 1;
      for(int to : g[v]){
            if(to <= n && (to > R || to < L))
                  continue;
            if(mt[to] == -1 || dfs(mt[to])){
                  mt[to] = v;
                  mt[v] = to;
                  return true;
            }
      }
      return false;
}

bool check(){
      if(mt[L] == -1)
            return true;
      while(!mr.empty()){
            int v = mr.back();
            if(mt[v] == -1){
                  for(int i = 0; i < vr.size(); i ++){
                        used[vr[i]] = 0;
                  }
                  if(!dfs(v)){
                        break;
                  }
            }
            mr.pop_back();
      }
      return mr.empty();
}

bool ok(){
      for(int i = n + 1; i <= n + m; i ++){
            if(mt[i] != -1){
                  mt[ mt[i] ] = -1;
                  mt[i] = -1;
            }
      }
      for(int i = n + 1; i <= n + m; i ++){
            for(int j = 0; j < (int)vr.size(); j ++){
                  used[ vr[j] ] = 0;
            }
            vr.clear();
            dfs(i);
      }
      for(int i = n + 1; i <= n + m; i ++){
            if(mt[i] == -1)
                  return false;
      }
      return true;
}

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

      for(int i = 1; i <= k; i ++){
            int a, b;
            scanf("%d %d", &a, &b);
            g[a].push_back(b + n);
            g[b + n].push_back(a);
      }

      for(int i = 1; i <= n + m; i ++){
            sort(g[i].begin(), g[i].end());
      }

      memset(mt, -1, sizeof(mt));

      int lo = 1, hi = n + 1;

      L = 1;

      while(lo < hi){
            int md = (lo + hi) >> 1;
            R = md;
            if(ok())
                  hi = md;
            else
                  lo = md + 1;
      }

      if(lo > n){
            cout << 0 << endl;
            return 0;
      }

      ans += n - lo + 1;

      R = lo;
      ok();

      if(mt[L] != -1){
            mt[mt[L]] = -1;
            mr.push_back(mt[L]);
      }

      int pt = lo;

      for(int i = 2; i <= n; i ++){
            L = i, R = pt;
            while(pt <= n && !check())
                  pt ++, R = pt;
            ans += n - pt + 1;
            if(mt[L] != -1){
                  mt[mt[L]] = -1;
                  mr.push_back(mt[L]);
            }
      }

      printf("%d", ans);
}

Compilation message

marriage.cpp: In function 'bool check()':
marriage.cpp:33:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                   for(int i = 0; i < vr.size(); i ++){
                                  ~~^~~~~~~~~~~
marriage.cpp: In function 'int main()':
marriage.cpp:67:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d %d %d", &n, &m, &k);
       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
marriage.cpp:71:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
78.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 3064 KB Output is correct
2 Incorrect 3 ms 3248 KB Output isn't correct
3 Incorrect 4 ms 3248 KB Output isn't correct
4 Correct 3 ms 3248 KB Output is correct
5 Correct 4 ms 3248 KB Output is correct
6 Correct 4 ms 3248 KB Output is correct
7 Correct 4 ms 3264 KB Output is correct
8 Correct 4 ms 3264 KB Output is correct
9 Correct 4 ms 3300 KB Output is correct
10 Correct 4 ms 3300 KB Output is correct
11 Correct 4 ms 3300 KB Output is correct
12 Correct 4 ms 3300 KB Output is correct
13 Incorrect 4 ms 3428 KB Output isn't correct
14 Correct 4 ms 3428 KB Output is correct
15 Correct 4 ms 3428 KB Output is correct
16 Correct 4 ms 3428 KB Output is correct
17 Correct 4 ms 3428 KB Output is correct
18 Correct 4 ms 3428 KB Output is correct
19 Correct 6 ms 3528 KB Output is correct
20 Correct 5 ms 3528 KB Output is correct
21 Correct 4 ms 3528 KB Output is correct
22 Correct 4 ms 3528 KB Output is correct
23 Correct 4 ms 3528 KB Output is correct
24 Correct 4 ms 3528 KB Output is correct
25 Correct 43 ms 4332 KB Output is correct
26 Incorrect 16 ms 4332 KB Output isn't correct
27 Correct 4 ms 4332 KB Output is correct
28 Correct 5 ms 4332 KB Output is correct
29 Correct 6 ms 4332 KB Output is correct
30 Correct 6 ms 4332 KB Output is correct
31 Correct 410 ms 6912 KB Output is correct
32 Correct 15 ms 6912 KB Output is correct
33 Correct 4 ms 6912 KB Output is correct
34 Correct 28 ms 6912 KB Output is correct
35 Correct 182 ms 7032 KB Output is correct
36 Correct 136 ms 7288 KB Output is correct
37 Execution timed out 1557 ms 14272 KB Time limit exceeded
38 Correct 31 ms 14272 KB Output is correct
39 Execution timed out 1578 ms 14272 KB Time limit exceeded
40 Correct 9 ms 14272 KB Output is correct
41 Incorrect 151 ms 14272 KB Output isn't correct
42 Correct 13 ms 14272 KB Output is correct
43 Correct 18 ms 14272 KB Output is correct
44 Correct 27 ms 14272 KB Output is correct
45 Incorrect 213 ms 14272 KB Output isn't correct
46 Execution timed out 1567 ms 14272 KB Time limit exceeded
47 Correct 31 ms 14272 KB Output is correct
48 Correct 29 ms 14272 KB Output is correct
49 Execution timed out 1572 ms 14272 KB Time limit exceeded
50 Execution timed out 1577 ms 14272 KB Time limit exceeded