Submission #1128401

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128401		KasymK	Political Development (BOI17_politicaldevelopment)	C++20	54 / 100	3095 ms	25020 KiB

politicaldevelopment

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 5e3+5;
bool adj[N][N];
int answer, n;

void dfs(vector<bool> &vis, int mal){
    umax(answer, mal);
    while(1){
        bool did=0;
        for(auto i : vis)
            did|=i;
        if(!did)
            break;
        int id=n;
        for(int i = n-1; i >= 0; --i)
            if(vis[i]){
                vis[i]=0;
                id=i;
                break;
            }
        vector<bool> is(n, false);
        for(int i = 0; i < n; ++i)
            if(vis[i] and adj[id][i])
                is[i]=1;
        int cnt=0;
        for(int i = 0; i < n; ++i)
            cnt+=is[i];
        if(cnt+mal+1>answer)
            dfs(is, mal+1);
    }
}


int main(){
    int k;
    scanf("%d%d", &n, &k);
    for(int i = 0; i < n; ++i){
        int x, ad;
        scanf("%d", &x);
        adj[i][i]=1;
        while(x--)
            scanf("%d", &ad), adj[i][ad]=1;
    }
    vector<bool> vis(n, true);
    dfs(vis, 0);
    printf("%d\n", answer);
    return 0;
}

Compilation message (stderr)

politicaldevelopment.cpp: In function 'int main()':
politicaldevelopment.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |     scanf("%d%d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~
politicaldevelopment.cpp:52:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~
politicaldevelopment.cpp:55:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |             scanf("%d", &ad), adj[i][ad]=1;
      |             ~~~~~^~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 0 / 23
• Subtask 4: 38 / 38
• Subtask 5: 0 / 23