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Submission #91408

# Submission time Handle Problem Language Result Execution time Memory
91408 2018-12-27T11:41:29 Z mirbek01 Marriage questions (IZhO14_marriage) C++11
100 / 100
 851 ms 5424 KB 
# include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 2;

int n, m, k, mt[N], used[N], ans, L, R, pt = 1;
vector <int> g[N], mr;

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

bool check(){
      while(!mr.empty()){
            int v = mr.back();
            if(mt[v] == -1){
                  memset(used, 0, sizeof(used));
                  if(!dfs(v))
                        return false;
            }
            mr.pop_back();
      }
      return mr.empty();
}

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 = n + 1; i <= n + m; i ++)
            sort(g[i].rbegin(), g[i].rend());

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

      for(int i = n + 1; i <= n + m; i ++)
            mr.push_back(i);

      for(int i = 1; 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 'int main()':
marriage.cpp:41:12: 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:45:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 3448 KB Output is correct
2 Correct 4 ms 3448 KB Output is correct
3 Correct 4 ms 3480 KB Output is correct
4 Correct 4 ms 3480 KB Output is correct
5 Correct 4 ms 3544 KB Output is correct
6 Correct 4 ms 3576 KB Output is correct
7 Correct 5 ms 3624 KB Output is correct
8 Correct 4 ms 3664 KB Output is correct
9 Correct 4 ms 3692 KB Output is correct
10 Correct 4 ms 3692 KB Output is correct
11 Correct 4 ms 3692 KB Output is correct
12 Correct 4 ms 3708 KB Output is correct
13 Correct 4 ms 3708 KB Output is correct
14 Correct 4 ms 3708 KB Output is correct
15 Correct 4 ms 3708 KB Output is correct
16 Correct 4 ms 3732 KB Output is correct
17 Correct 4 ms 3732 KB Output is correct
18 Correct 4 ms 3732 KB Output is correct
19 Correct 8 ms 3732 KB Output is correct
20 Correct 8 ms 3732 KB Output is correct
21 Correct 6 ms 3732 KB Output is correct
22 Correct 7 ms 3732 KB Output is correct
23 Correct 8 ms 3732 KB Output is correct
24 Correct 8 ms 3836 KB Output is correct
25 Correct 33 ms 3836 KB Output is correct
26 Correct 24 ms 3836 KB Output is correct
27 Correct 15 ms 3836 KB Output is correct
28 Correct 15 ms 3836 KB Output is correct
29 Correct 16 ms 3836 KB Output is correct
30 Correct 16 ms 3836 KB Output is correct
31 Correct 138 ms 4348 KB Output is correct
32 Correct 35 ms 4348 KB Output is correct
33 Correct 23 ms 4348 KB Output is correct
34 Correct 34 ms 4348 KB Output is correct
35 Correct 179 ms 4732 KB Output is correct
36 Correct 150 ms 4776 KB Output is correct
37 Correct 381 ms 4776 KB Output is correct
38 Correct 91 ms 5036 KB Output is correct
39 Correct 330 ms 5036 KB Output is correct
40 Correct 193 ms 5036 KB Output is correct
41 Correct 230 ms 5036 KB Output is correct
42 Correct 306 ms 5036 KB Output is correct
43 Correct 303 ms 5036 KB Output is correct
44 Correct 330 ms 5036 KB Output is correct
45 Correct 622 ms 5036 KB Output is correct
46 Correct 807 ms 5372 KB Output is correct
47 Correct 605 ms 5372 KB Output is correct
48 Correct 602 ms 5372 KB Output is correct
49 Correct 806 ms 5424 KB Output is correct
50 Correct 851 ms 5424 KB Output is correct