Submission #100821

#	Time	Username	Problem	Language	Result	Execution time	Memory
100821		MohamedAhmed0	Topovi (COCI15_topovi)	C++14	120 / 120	384 ms	45380 KiB

topovi

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

struct chash {
    int operator()(pair<int , int> x) const { return x.first* 31 + x.second; }
};

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

gp_hash_table< pair<int,  int> , long long , chash> mp ;
gp_hash_table<int , long long , custom_hash>rows , columns ;
gp_hash_table<int , long long , custom_hash>rowcnt , columncnt ;

long long n , k , p ;

long long ans = 0ll ;

void update(int r , int c , int x)
{
    ans -= (n - rowcnt[columns[c]]) ;
    ans -= (n - columncnt[rows[r]]) ;
    //handle double counting
    if(rows[r] == columns[c])
        ans++ ;
    rowcnt[rows[r]]-- ;
    rows[r] ^= x ;
    rowcnt[rows[r]]++;
    columncnt[columns[c]]-- ;
    columns[c] ^= x ;
    columncnt[columns[c]]++ ;
    ans += (n - rowcnt[columns[c]]) ;
    ans += (n - columncnt[rows[r]]) ;
    //handle double counting
    if(rows[r] == columns[c])
        ans-- ;
    return ;
}

int main()
{
    scanf("%lld %lld %lld" , &n , &k , &p) ;
    rowcnt[0] = columncnt[0] = n ;
    for(int i = 0 ; i < k ; ++i)
    {
        int a , b ;
        long long c ;
        scanf("%d %d %lld" , &a , &b , &c) ;
        mp[{a , b}] = c ;
        update(a , b , c) ;
    }
    while(p--)
    {
        int a , b , c , d ;
        scanf("%d %d %d %d" , &a , &b , &c , &d) ;
        int x = mp[{a , b}] ;
        update(a , b , x) ;
        update(c , d , x) ;
        mp[{c , d}] = x ;
        printf("%lld\n" , ans) ;
    }
    return 0 ;
}

Compilation message (stderr)

topovi.cpp: In function 'int main()':
topovi.cpp:56:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld %lld" , &n , &k , &p) ;
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
topovi.cpp:62:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %lld" , &a , &b , &c) ;
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
topovi.cpp:69:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d %d" , &a , &b , &c , &d) ;
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 120 / 120