Submission #849344

#	Time	Username	Problem	Language	Result	Execution time	Memory
849344		LTTrungCHL	Političari (COCI20_politicari)	C++17	10 / 70	14 ms	3628 KiB

politicari

///***LTT***///
/// ->TUYEN QUOC GIA<- ///
#include<bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("popcnt")
#define int long long
#define endl "\n"
#define F first
#define S second
#define pb push_back
#define CHECKBIT(mask,i) ((mask>>(i) )&1) // == 1 la bat, == 0 la tat
#define OFFBIT(mask,i) ((1<<(i))^mask) // tat bit thu i
#define ONBIT(mask,i) ((1<<(i))mask) // bat bit thu i
using namespace std;
const long long oo = 1e9+7;
const int N = 2 * 1e5 + 10;
int n, a[505][505],  k;
vector <int> ans;
bool dd[505][505];
void inp(){
    cin >> n >> k;
    for (int i = 1;i <= n;i++){
        for (int j = 1;j <= n;j++){
            cin >> a[i][j];
        }
    }
    return;
}
void solve(){
    ans.pb(1);
    ans.pb(2);
    int tt = 2;
    int p = 1;
    int u = 2;
    int preu = u;
    int prep = p;
    while (!dd[u][p] and tt <= k){
        dd[u][p] = true;
        preu = u;
        prep = p;
        u = a[preu][prep];
        p = preu;
        if (dd[u][p]) break;
        ans.pb(u);
        ++tt;
    }
    ans.pop_back();
//    for (int i = 0;i < ans.size();i++){
//        cout << ans[i] <<"\n";
//    }
    int sz = ans.size();
    int o = k % sz;
    if (o == 0) o = sz;
    cout  << ans[o - 1];
    return;
}
signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    cout.tie(NULL);
    if (fopen("file.inp", "r")){
        freopen("file.inp", "r", stdin);
        freopen("file.out", "w", stdout);
    }
    //int t;
    //cin >> t;
    //while(t--){
    inp();
    solve();
    //}
}

Compilation message (stderr)

politicari.cpp: In function 'int main()':
politicari.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen("file.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
politicari.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen("file.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 70