제출 #249857

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
249857		Nightlight	Bali Sculptures (APIO15_sculpture)	C++14	100 / 100	355 ms	1016 KiB

sculpture

#include <bits/stdc++.h>
using namespace std;
 
int N, A, B;
long long pre[2005];
long long mask;
bitset<2005> valid[2005];
 
long long ans = (1LL << 42) - 1;
 
bool check(long long T) {
  return ((T | mask) ^ mask) == 0;
}
 
bool can(int X) {
  for(int i = 1; i < N; i++) {
    for(int j = i + 1; j <= N; j++) {
      valid[i][j] = check(pre[j] - pre[i]);
    }
  }
  bitset<2005> now[2];
  for(int j = 1; j <= N; j++) {
    if(check(pre[j])) {
      now[1] |= valid[j];
    }
  }
  if(A == 1 && check(pre[N])) return 1;
  int skrg, sblm;
  for(int i = 2; i <= B; i++) {
    skrg = i & 1, sblm = !skrg;
    now[skrg] = 0;
    for(int j = i; j <= N; j++) {
      if(now[sblm][j]) {
        now[skrg] |= valid[j];
      }
    }
    if(i >= A && now[sblm][N]) return 1;  
  }
  return 0;
}
 
int main() {
  scanf("%d %d %d", &N, &A, &B);
  for(int i = 1; i <= N; i++) {
    scanf("%lld", &pre[i]);
    pre[i] += pre[i - 1];
  }
  for(int i = 41; i >= 0; i--) {
    mask = ans - (1LL << i);
    if(can(i)) {
      ans -= (1LL << i);
    }
  }
  printf("%lld\n", ans);
}

컴파일 시 표준 에러 (stderr) 메시지

sculpture.cpp: In function 'int main()':
sculpture.cpp:43:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d", &N, &A, &B);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sculpture.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &pre[i]);
     ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 25 / 25
• Subtask 5: 29 / 29