oj.uz

Submission #171789

# Submission time Handle Problem Language Result Execution time Memory
171789 2019-12-30T12:06:45 Z VEGAnn Marriage questions (IZhO14_marriage) C++14
56 / 100
 152 ms 1016 KB 
#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define PB push_back
#define MP make_pair
#define ft first
#define sd second
#define pii pair<int, int>
#define pi3 pair<pii, int>
#define MP3(a,b,c) MP(MP(a, b), c)
using namespace std;
const int oo = 1e9;
const int N = 2000;
const int K = 110;
const int PW = 20;

struct edge{
    int x, y, cap, flow;

    edge(int _x, int _y, int _c, int _f): x(_x), y(_y), cap(_c), flow(_f) {}
};

vector<edge> edges;
queue<int> q;
vector<int> g[N];
int ans = 0, s, t, n, m, k, dst[N], ptr[N], X[N], Y[N];

void add_edge(int x, int y, int cap){

    g[x].PB(sz(edges));
    edges.PB(edge(x, y, cap, 0));

    g[y].PB(sz(edges));
    edges.PB(edge(y, x, 0, 0));

}

bool bad(int l, int r, int v){
    if (v == s || v == t || v < m) return 0;
    return !(m + l <= v && v <= m + r);
}

bool bfs(){
    fill(dst, dst + t + 1, oo);

    dst[s] = 0;
    while (sz(q)) q.pop();
    q.push(s);

    while (sz(q)){
        int v = q.front(); q.pop();

        for (int nm : g[v]){
            edge u = edges[nm];
            if (u.cap > u.flow && dst[u.y] > dst[v] + 1){
                dst[u.y] = dst[v] + 1;
                q.push(u.y);
            }
        }
    }

    return (dst[t] < oo);
}

int dfs(int v, int pshd){
    if (pshd == 0) return 0;
    if (v == t) return pshd;
    for (; ptr[v] < sz(g[v]); ptr[v]++){
        int nm = g[v][ptr[v]];
        edge u = edges[nm];
        if (dst[u.y] != dst[v] + 1) continue;
        int nw = dfs(u.y, min(pshd, u.cap - u.flow));
        if (nw){
            edges[nm].flow += nw;
            edges[nm ^ 1].flow -= nw;
            return nw;
        }
    }
    return 0;
}

bool ok(int l, int r){

    for (int i = 0; i <= t; i++)
        g[i].clear();

    edges.clear();

    for (int i = 0; i < k; i++){
        if (bad(l, r, m + Y[i])) continue;
        add_edge(X[i], m + Y[i], 1);
    }

    for (int i = 0; i < m; i++)
        add_edge(s, i, 1);

    for (int i = l; i <= r; i++)
        add_edge(m + i, t, 1);

    int flow = 0;

    while (bfs()){
        fill(ptr, ptr + t + 1, 0);
        int pshd = dfs(s, oo);
        while (pshd > 0){
            flow += pshd;
            pshd = dfs(s, oo);
        }
    }

    return (flow == m);
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

    cin >> n >> m >> k;

    for (int i = 0; i < k; i++){
        cin >> Y[i] >> X[i];
        Y[i]--; X[i]--;
    }

    s = n + m;
    t = n + m + 1;

    for (int l = 0, r = 0; l < n; l++){
        while (r < n && !ok(l, r))
            r++;
        if (r >= n) break;
        ans += n - r;
    }

    cout << ans;

    return 0;
}

Subtask #1
56.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 3 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 3 ms 380 KB Output is correct
19 Correct 16 ms 504 KB Output is correct
20 Correct 8 ms 376 KB Output is correct
21 Correct 4 ms 380 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 7 ms 504 KB Output is correct
24 Correct 6 ms 504 KB Output is correct
25 Incorrect 12 ms 632 KB Output isn't correct
26 Incorrect 95 ms 504 KB Output isn't correct
27 Correct 25 ms 504 KB Output is correct
28 Correct 20 ms 504 KB Output is correct
29 Incorrect 14 ms 504 KB Output isn't correct
30 Incorrect 11 ms 504 KB Output isn't correct
31 Incorrect 81 ms 632 KB Output isn't correct
32 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
33 Correct 139 ms 504 KB Output is correct
34 Correct 152 ms 712 KB Output is correct
35 Incorrect 67 ms 688 KB Output isn't correct
36 Incorrect 68 ms 632 KB Output isn't correct
37 Runtime error 4 ms 888 KB Execution killed with signal 11 (could be triggered by violating memory limits)
38 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
39 Runtime error 3 ms 764 KB Execution killed with signal 11 (could be triggered by violating memory limits)
40 Runtime error 4 ms 888 KB Execution killed with signal 11 (could be triggered by violating memory limits)
41 Runtime error 4 ms 892 KB Execution killed with signal 11 (could be triggered by violating memory limits)
42 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
43 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
44 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
45 Runtime error 4 ms 888 KB Execution killed with signal 11 (could be triggered by violating memory limits)
46 Runtime error 5 ms 1016 KB Execution killed with signal 11 (could be triggered by violating memory limits)
47 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
48 Runtime error 4 ms 760 KB Execution killed with signal 11 (could be triggered by violating memory limits)
49 Runtime error 4 ms 888 KB Execution killed with signal 11 (could be triggered by violating memory limits)
50 Runtime error 3 ms 636 KB Execution killed with signal 11 (could be triggered by violating memory limits)