Submission #612030

#	Time	Username	Problem	Language	Result	Execution time	Memory
612030		HediChehaidar	Simurgh (IOI17_simurgh)	C++17	13 / 100	174 ms	340 KiB

simurgh

#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define dte  tuple<double , double , double>
using namespace std;
const int INF = 1000*1000*1000; // 1 e 9
const int MOD = 1e9 + 7;//998244353 ;
const double EPS = 0.000000001; // 1 e -9
const ll inf = (ll)1e18;

#include"simurgh.h"
/*int count_common_roads(vi v){
    cout << "req  ";
    for(auto c : v) cout << c << " "; cout << endl;
    int ans; cin>>ans; return ans;
}*/
int n , m;
vi adj[505];
int nb[505][505];
vi v , ans;
bool vis[7];
bool ok[50];
int cnt = 0;
void dfs(int pos){
    if(vis[pos]) return ;
    vis[pos] = true; cnt++;
    for(auto c : adj[pos]) if(ok[nb[pos][c]]) dfs(c);
}
vi find_roads(int N , vi a , vi b){
    n = N; m = a.size();
    if(n > 7) return ans;
    for(int i = 0 ; i < m ; i++){
        int x = a[i] , y = b[i];
        nb[x][y] = nb[y][x] = i;
        adj[x].pb(y); adj[y].pb(x);
    }
    for(int i = 0 ; i < (1 << m) ; i++){
        v.clear();
        for(int j = 0 ; j < m ; j++){
            if((1 << j) & i){
                v.pb(j); ok[j] = true;
            }
            else ok[j] = false;
        }
        if(v.size() != n - 1) continue;
        memset(vis , 0 , sizeof vis); cnt = 0;
        dfs(0);
        if(cnt == n) {
            int x = count_common_roads(v);
            if(x == n - 1) return v;
        }
    }
    return ans;
}

/*int main(){
    //ifstream fin ("testing.txt");
    //ofstream fout ("output.txt");
    ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int nn , mm; cin>>nn>>mm;
    vi a(mm) , b(mm); for(int i = 0 ; i < mm ; i++) cin>>a[i]>>b[i];
    for(auto c : find_roads(nn , a , b)) cout << c << " "; cout << "\n";
    return 0;
}*/
/*
4 6
0 1
0 2
0 3
1 2
1 3
2 3
*/
/*
    Think of : BS / DFS / BFS / SSSP / SCC / MSP / MAX FLOW / TOPSORT / LCA / MATRIX / DP(bitmask) / 2 POINTERS / SEG TREE / MATH / UN FIND / MO / HLD
    Read the statement CAREFULLY !!
    Make a GREADY APPROACH !!!! (start from highest / lowest)
    Make your own TESTS !!
    Be careful from CORNER CASES !
*/

Compilation message (stderr)

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:61:21: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   61 |         if(v.size() != n - 1) continue;
      |            ~~~~~~~~~^~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30