oj.uz

Submission #788254

# Submission time Handle Problem Language Result Execution time Memory
788254 2023-07-20T03:47:16 Z Username4132 Povjerenstvo (COI22_povjerenstvo) C++14
0 / 100
 3000 ms 87820 KB 
#include<iostream>
#include<vector>
#include<algorithm>
#include<cassert>
using namespace std;
#define forn(i, n) for(int i=0; i<(int)n; ++i)
#define PB push_back

const int MAXN = 500010;
int n, m, cn;
bool vis[MAXN], del[MAXN], ans[MAXN], allow[MAXN];
vector<int> g[MAXN], gi[MAXN], order, lst;

void dfs1(int v){
    vis[v]=true;
    for(int to:g[v]) if(!vis[to] && !del[to]) dfs1(to);
    order.PB(v);
}

void dfs2(int v){
    vis[v]=true;
    for(int to:gi[v]) if(!vis[to] && !del[to]) dfs2(to);
    lst.PB(v);
}

void dfs3(int v, bool flag){
    vis[v]=true;
    ans[v]=flag;
    for(int to:gi[v]) if(!del[to]){
        del[to]=true;
        if(!vis[to] && allow[to]) dfs3(to, !flag);
    }
}

int main(){
    scanf("%d %d", &n, &m);
    forn(i, m){
        int a, b; scanf("%d %d", &a, &b); --a, --b;
        g[a].PB(b), gi[b].PB(a);
    }
    while(true){
        order.clear();
        lst.clear();
        forn(i, n) vis[i]=false;
        forn(i, n) if(!vis[i] && !del[i]) dfs1(i);
        if(order.empty()) break;
        reverse(order.begin(), order.end());
        forn(i, n) vis[i]=false;
        for(int el:order) if(!vis[el]) lst.clear(), dfs2(el);
        int v = lst.back();
        assert(!del[v]);
        del[v]=true;
        forn(i, n) vis[i]=allow[i]=false;
        for(int el:lst) allow[el]=true;
        dfs3(v, true);
    }
    forn(i, n) cn+=ans[i];
    printf("%d\n", cn);
    forn(i, n) if(ans[i]) printf("%d ", i+1);
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:36:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:38:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         int a, b; scanf("%d %d", &a, &b); --a, --b;
      |                   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 13.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3007 ms 87772 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 21.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3029 ms 87820 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 96 ms 24404 KB Output is correct
2 Correct 115 ms 24020 KB Output is correct
3 Correct 12 ms 24020 KB Output is correct
4 Correct 125 ms 24112 KB Output is correct
5 Correct 153 ms 24104 KB Output is correct
6 Correct 154 ms 24020 KB Output is correct
7 Incorrect 161 ms 24096 KB For each person outside the committee there should be someone in the committee who they dislike.
8 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3007 ms 87772 KB Time limit exceeded
2 Halted 0 ms 0 KB -