제출 #732957

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
732957		PoonYaPat	비스킷 담기 (IOI20_biscuits)	C++14	100 / 100	70 ms	1336 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll qs[60],sum[60],bag;

ll find(ll x) {
    if (x<0) return 0;
    if (x==0) return 1;
    if (x==1) return qs[0];

    int k;
    for (int i=59; i>0; --i) {
        if ((1ll<<i)<=x) {
            k=i;
            break;
        }
    }
    return qs[k-1]+find(min(x-(1ll<<k),(sum[k]/bag)-(1ll<<k)));
}

ll count_tastiness(ll X, vector<ll> a) {
    bag=X;
    sum[0]=a[0];
    if (a[0]>=bag) qs[0]=2;
    else qs[0]=1;

    for (int i=1; i<60; ++i) {
        if (i<a.size()) sum[i]=sum[i-1]+(1ll<<i)*a[i];
        else sum[i]=sum[i-1];
        qs[i]=find((1ll<<(i+1))-1);
    }

    return qs[59];
}

컴파일 시 표준 에러 (stderr) 메시지

biscuits.cpp: In function 'll count_tastiness(ll, std::vector<long long int>)':
biscuits.cpp:30:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         if (i<a.size()) sum[i]=sum[i-1]+(1ll<<i)*a[i];
      |             ~^~~~~~~~~
biscuits.cpp: In function 'll find(ll)':
biscuits.cpp:20:57: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |     return qs[k-1]+find(min(x-(1ll<<k),(sum[k]/bag)-(1ll<<k)));
      |                                                     ~~~~^~~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 21 / 21
• Subtask 4: 35 / 35
• Subtask 5: 23 / 23