oj.uz

Submission #95474

# Submission time Handle Problem Language Result Execution time Memory
95474 2019-02-01T13:31:59 Z choikiwon Marriage questions (IZhO14_marriage) C++17
100 / 100
 788 ms 4728 KB 
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;

const int MN = 100010;

int N, M, K;
vector<int> adj[MN];
int vis[MN], who[MN], timer;
vector<int> rem;

bool dfs(int u, int l, int r) {
    if(vis[u] == timer) return false;
    vis[u] = timer;

    for(int i = 0; i < adj[u].size(); i++) {
        int v = adj[u][i];
        if(v < l || r < v) continue;

        if(who[v] == -1 || dfs(who[v], l, r)) {
            who[v] = u;
            return true;
        }
    }
    return false;
}

bool check(int l, int r) {
    while(rem.size()) {
        int t = rem.back(); rem.pop_back();

        timer++;
        if(!dfs(t, l, r)) {
            rem.push_back(t);
            return false;
        }
    }
    return true;
}

int main() {
    scanf("%d %d %d", &N, &M, &K);

    for(int i = 0; i < K; i++) {
        int a, b; scanf("%d %d", &a, &b);
        a--; b--;

        adj[b].push_back(a);
    }
    memset(who, -1, sizeof(who));

    for(int i = 0; i < M; i++) rem.push_back(i);
    ll ans = 0;
    int j = 0;
    for(int i = 0; i < N; i++) {
        while(j <= N && !check(i, j - 1)) j++;
        if(rem.size()) break;
        ans += N - j + 1;

        if(who[i] != -1) {
            rem.push_back(who[i]);
        }
    }
    printf("%lld", ans);
}

Compilation message

marriage.cpp: In function 'bool dfs(int, int, int)':
marriage.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < adj[u].size(); i++) {
                    ~~^~~~~~~~~~~~~~~
marriage.cpp: In function 'int main()':
marriage.cpp:43:10: 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:46:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a, b; scanf("%d %d", &a, &b);
                   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 3064 KB Output is correct
2 Correct 4 ms 3064 KB Output is correct
3 Correct 4 ms 3064 KB Output is correct
4 Correct 4 ms 3064 KB Output is correct
5 Correct 3 ms 3064 KB Output is correct
6 Correct 4 ms 3064 KB Output is correct
7 Correct 4 ms 3064 KB Output is correct
8 Correct 4 ms 3064 KB Output is correct
9 Correct 4 ms 3064 KB Output is correct
10 Correct 4 ms 3064 KB Output is correct
11 Correct 4 ms 3064 KB Output is correct
12 Correct 4 ms 3064 KB Output is correct
13 Correct 6 ms 3064 KB Output is correct
14 Correct 4 ms 3064 KB Output is correct
15 Correct 4 ms 3064 KB Output is correct
16 Correct 4 ms 3064 KB Output is correct
17 Correct 4 ms 3064 KB Output is correct
18 Correct 4 ms 3064 KB Output is correct
19 Correct 6 ms 3064 KB Output is correct
20 Correct 5 ms 3064 KB Output is correct
21 Correct 4 ms 3064 KB Output is correct
22 Correct 4 ms 3064 KB Output is correct
23 Correct 5 ms 3064 KB Output is correct
24 Correct 4 ms 3036 KB Output is correct
25 Correct 39 ms 3192 KB Output is correct
26 Correct 8 ms 3064 KB Output is correct
27 Correct 4 ms 3064 KB Output is correct
28 Correct 4 ms 3064 KB Output is correct
29 Correct 6 ms 3192 KB Output is correct
30 Correct 6 ms 3192 KB Output is correct
31 Correct 279 ms 3704 KB Output is correct
32 Correct 5 ms 3192 KB Output is correct
33 Correct 4 ms 3064 KB Output is correct
34 Correct 5 ms 3064 KB Output is correct
35 Correct 106 ms 4344 KB Output is correct
36 Correct 83 ms 4216 KB Output is correct
37 Correct 788 ms 3904 KB Output is correct
38 Correct 24 ms 4344 KB Output is correct
39 Correct 65 ms 3192 KB Output is correct
40 Correct 7 ms 3192 KB Output is correct
41 Correct 11 ms 3448 KB Output is correct
42 Correct 11 ms 3448 KB Output is correct
43 Correct 14 ms 3704 KB Output is correct
44 Correct 21 ms 4472 KB Output is correct
45 Correct 12 ms 3576 KB Output is correct
46 Correct 28 ms 4600 KB Output is correct
47 Correct 25 ms 4600 KB Output is correct
48 Correct 22 ms 4472 KB Output is correct
49 Correct 35 ms 4728 KB Output is correct
50 Correct 210 ms 3284 KB Output is correct