oj.uz

Submission #91385

# Submission time Handle Problem Language Result Execution time Memory
91385 2018-12-27T09:47:20 Z mirbek01 Marriage questions (IZhO14_marriage) C++11
44 / 100
 1500 ms 12436 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 > R || to < L) && to <= n)
                  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();
            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, pos = -1;

      L = 1;

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

      if(pos == -1){
            cout << 0 << endl;
            return 0;
      }

      ans += n - pos + 1;

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

      int pt = pos;

      for(int i = 2; i <= n - m + 1; i ++){
            int lo = 1, hi = 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:32:30: 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:108:17: warning: unused variable 'lo' [-Wunused-variable]
             int lo = 1, hi = i;
                 ^~
marriage.cpp:108:25: warning: unused variable 'hi' [-Wunused-variable]
             int lo = 1, hi = i;
                         ^~
marriage.cpp:65:12: 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:69:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
44.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 3064 KB Output isn't correct
2 Incorrect 3 ms 3244 KB Output isn't correct
3 Incorrect 3 ms 3244 KB Output isn't correct
4 Incorrect 3 ms 3244 KB Output isn't correct
5 Correct 3 ms 3244 KB Output is correct
6 Correct 3 ms 3244 KB Output is correct
7 Incorrect 4 ms 3244 KB Output isn't correct
8 Correct 4 ms 3244 KB Output is correct
9 Correct 4 ms 3264 KB Output is correct
10 Correct 4 ms 3264 KB Output is correct
11 Correct 4 ms 3264 KB Output is correct
12 Correct 4 ms 3264 KB Output is correct
13 Incorrect 4 ms 3264 KB Output isn't correct
14 Incorrect 4 ms 3392 KB Output isn't correct
15 Correct 4 ms 3392 KB Output is correct
16 Incorrect 4 ms 3392 KB Output isn't correct
17 Incorrect 4 ms 3392 KB Output isn't correct
18 Incorrect 4 ms 3392 KB Output isn't correct
19 Incorrect 6 ms 3396 KB Output isn't correct
20 Incorrect 5 ms 3396 KB Output isn't correct
21 Correct 4 ms 3396 KB Output is correct
22 Incorrect 4 ms 3396 KB Output isn't correct
23 Incorrect 4 ms 3396 KB Output isn't correct
24 Incorrect 4 ms 3396 KB Output isn't correct
25 Correct 44 ms 4060 KB Output is correct
26 Incorrect 15 ms 4060 KB Output isn't correct
27 Correct 4 ms 4060 KB Output is correct
28 Incorrect 4 ms 4060 KB Output isn't correct
29 Correct 6 ms 4060 KB Output is correct
30 Correct 6 ms 4060 KB Output is correct
31 Incorrect 423 ms 6132 KB Output isn't correct
32 Correct 14 ms 6132 KB Output is correct
33 Correct 4 ms 6132 KB Output is correct
34 Incorrect 20 ms 6132 KB Output isn't correct
35 Incorrect 174 ms 6132 KB Output isn't correct
36 Incorrect 144 ms 6132 KB Output isn't correct
37 Execution timed out 1570 ms 12436 KB Time limit exceeded
38 Correct 30 ms 12436 KB Output is correct
39 Incorrect 429 ms 12436 KB Output isn't correct
40 Correct 8 ms 12436 KB Output is correct
41 Incorrect 188 ms 12436 KB Output isn't correct
42 Correct 11 ms 12436 KB Output is correct
43 Correct 16 ms 12436 KB Output is correct
44 Correct 26 ms 12436 KB Output is correct
45 Incorrect 199 ms 12436 KB Output isn't correct
46 Execution timed out 1568 ms 12436 KB Time limit exceeded
47 Correct 30 ms 12436 KB Output is correct
48 Correct 29 ms 12436 KB Output is correct
49 Execution timed out 1567 ms 12436 KB Time limit exceeded
50 Incorrect 605 ms 12436 KB Output isn't correct