제출 #28747

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
28747		rondojim	Ice Hockey World Championship (CEOI15_bobek)	C++14	0 / 100	486 ms	13548 KiB

bobek

#include <stdio.h>
#include <vector>
#include <algorithm>
 
using namespace std;
 
const int MAXN = 40;
 
typedef long long ll;
 
ll N, K, A[MAXN], result;
 
int main(){
#ifdef DEBUG
  freopen("input.txt", "r", stdin);
#endif
  scanf("%lld %lld", &N, &K);
  for(int i=0; i<N; ++i) scanf("%lld", &A[i]);
  int middle = N / 2, remain = N - N / 2;
  vector<ll> sums;
  for(int bitm=0; bitm<(1<<middle); ++bitm){
    ll sum = 0;
    for(int i=0; i<middle; ++i) if(bitm & (1<<i)) sum += A[i];
    sums.push_back(sum);
  }
  sort(sums.begin(), sums.end());
  for(int bitm=0; bitm<(1<<remain); ++bitm){
    ll sum = 0;
    for(int i=0; i<remain; ++i) if(bitm & (1<<i)) sum += A[middle + i];
    int lo = 0, hi = sums.size() - 1, res = -1, mid;
    while(lo <= hi){
      mid = (lo + hi)>>1;
      if(sums[mid] + sum < K) lo = mid + 1;
      else res = mid, hi = mid - 1;
    }
    if(res != -1) result += sums.size() - res;
  }
  printf("%lld\n", result);
  return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

bobek.cpp: In function 'int main()':
bobek.cpp:17:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld", &N, &K);
                             ^
bobek.cpp:18:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for(int i=0; i<N; ++i) scanf("%lld", &A[i]);
                                              ^

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