oj.uz

Submission #91415

# Submission time Handle Problem Language Result Execution time Memory
91415 2018-12-27T11:56:00 Z mirbek01 Marriage questions (IZhO14_marriage) C++11
88 / 100
 314 ms 3232 KB 
# include <bits/stdc++.h>

using namespace std;

const int N = 30002;

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
88.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1272 KB Output is correct
2 Correct 2 ms 1272 KB Output is correct
3 Correct 2 ms 1304 KB Output is correct
4 Correct 2 ms 1304 KB Output is correct
5 Correct 3 ms 1400 KB Output is correct
6 Correct 2 ms 1400 KB Output is correct
7 Correct 2 ms 1400 KB Output is correct
8 Correct 2 ms 1400 KB Output is correct
9 Correct 2 ms 1440 KB Output is correct
10 Correct 2 ms 1440 KB Output is correct
11 Correct 2 ms 1516 KB Output is correct
12 Correct 3 ms 1532 KB Output is correct
13 Correct 2 ms 1532 KB Output is correct
14 Correct 3 ms 1532 KB Output is correct
15 Correct 2 ms 1532 KB Output is correct
16 Correct 2 ms 1532 KB Output is correct
17 Correct 3 ms 1532 KB Output is correct
18 Correct 3 ms 1532 KB Output is correct
19 Correct 5 ms 1532 KB Output is correct
20 Correct 4 ms 1532 KB Output is correct
21 Correct 3 ms 1532 KB Output is correct
22 Correct 3 ms 1536 KB Output is correct
23 Correct 4 ms 1536 KB Output is correct
24 Correct 3 ms 1536 KB Output is correct
25 Correct 20 ms 1660 KB Output is correct
26 Correct 9 ms 1660 KB Output is correct
27 Correct 5 ms 1660 KB Output is correct
28 Correct 5 ms 1660 KB Output is correct
29 Correct 7 ms 1660 KB Output is correct
30 Correct 7 ms 1664 KB Output is correct
31 Correct 117 ms 2148 KB Output is correct
32 Correct 13 ms 2148 KB Output is correct
33 Correct 8 ms 2148 KB Output is correct
34 Correct 12 ms 2148 KB Output is correct
35 Correct 157 ms 2556 KB Output is correct
36 Correct 128 ms 2556 KB Output is correct
37 Correct 314 ms 2556 KB Output is correct
38 Correct 80 ms 2816 KB Output is correct
39 Correct 147 ms 2816 KB Output is correct
40 Correct 59 ms 2816 KB Output is correct
41 Correct 70 ms 2816 KB Output is correct
42 Correct 93 ms 2816 KB Output is correct
43 Correct 96 ms 2816 KB Output is correct
44 Correct 112 ms 2816 KB Output is correct
45 Incorrect 184 ms 2816 KB Output isn't correct
46 Incorrect 199 ms 3196 KB Output isn't correct
47 Incorrect 185 ms 3196 KB Output isn't correct
48 Incorrect 193 ms 3196 KB Output isn't correct
49 Incorrect 199 ms 3232 KB Output isn't correct
50 Incorrect 165 ms 3232 KB Output isn't correct