Submission #927158

#	Time	Username	Problem	Language	Result	Execution time	Memory
927158		vjudge1	Paths (BOI18_paths)	C++17	20 / 100	589 ms	110264 KiB

paths

// By ObeliX
#include <bits/stdc++.h>
#pragma GCC target( "sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#include <unordered_map>
#include <cstddef>
#include <cassert>
#include <bitset>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cmath>
#include <queue>
#include <map>
#include <set>

using namespace std;

const long long N = 1e6 + 5;
const long long MOD = 1e9+7;
const long long INF = 1e18;

string al = "abcdefghijklmnopqrstuvwxyz";

long long n , m , k;
long long col[N];
long long cnt[10][N];

set <long long> g[N];

int main(){
    //freopen( "cinema.in" , "r" , stdin );
    //freopen( "cinema.out" , "w" , stdout );
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m >> k;
    for ( int i = 1 ; i <= n ; i++ ) {
        cin >> col[i];
    }
    if ( k == 1 ) {
        for ( int i = 1 ; i <= m ; i++ ) {
            long long x , y;
            cin >> x >> y;
        }
        cout << 0;
    }
    else if ( k == 2 ) {
        set <pair<long long , long long>> v;
        for ( int i = 1 ; i <= m ; i++ ) {
            long long x , y;
            cin >> x >> y;
            if ( col[x] != col[y] ) {
                v.insert( { x , y } );
                v.insert( { y , x } );
            }
        }
        cout << v.size();
    }
    else if ( k == 3 ) {
        long long ans = 0;
        set <pair<long long , long long>> v;
        for ( int i = 1 ; i <= m ; i++ ) {
            long long x , y;
            cin >> x >> y;
            if ( col[x] != col[y] ) {
                v.insert( { x , y } );
                v.insert( { y , x } );
                g[x].insert( y );
                cnt[col[y]][x]++;
                g[y].insert( x );
                cnt[col[x]][y]++;
            }
        }
        for ( auto it : v ) {
            ans += cnt[6-(col[it.first] + col[it.second])][it.second];
        }
        cout << ans + v.size();
    }
}

• Subtask 1: 0 / 23
• Subtask 2: 20 / 20
• Subtask 3: 0 / 27
• Subtask 4: 0 / 30