제출 #222245

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
222245		DodgeBallMan	Ice Hockey World Championship (CEOI15_bobek)	C++14	0 / 100	776 ms	1048580 KiB

bobek

#include <bits/stdc++.h>

using namespace std;

int n;
long long m, va[2][25], s[2], ans;
vector<long long> all[2];

void permute( int ty, int now, int ok, long long sum = 0 ) {
    if( ok ) sum += va[0][now];
    if( now == s[ty] ) {
        all[ty].emplace_back( sum );
        return ;
    }
    permute( ty, now+1, 0, sum ), permute( ty, now+1, 1, sum );
}

int main()
{
    scanf("%d %lld",&n,&m);
    s[0] = n/2;
    s[1] = n - s[0];
    for( int i = 1 ; i <= s[0] ; i++ ) scanf("%lld",&va[0][i]);
    for( int i = 1 ; i <= s[1] ; i++ ) scanf("%lld",&va[1][i]);
    permute( 0, 1, 0 ), permute( 0, 1, 1 );
    permute( 1, 1, 0 ), permute( 1, 1, 1 );
    sort( all[0].begin(), all[0].end() ), sort( all[1].begin(), all[1].end() );
    for( long long i : all[0] ) {
        long long temp = m - i;
        int idx = upper_bound( all[1].begin(), all[1].end(), temp ) - all[1].begin();
        ans += ( long long )idx;
    }
    printf("%lld",ans);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

bobek.cpp: In function 'int main()':
bobek.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %lld",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~~~
bobek.cpp:23:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for( int i = 1 ; i <= s[0] ; i++ ) scanf("%lld",&va[0][i]);
                                        ~~~~~^~~~~~~~~~~~~~~~~~
bobek.cpp:24:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for( int i = 1 ; i <= s[1] ; i++ ) scanf("%lld",&va[1][i]);
                                        ~~~~~^~~~~~~~~~~~~~~~~~

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