Submission #813729

#	Time	Username	Problem	Language	Result	Execution time	Memory
813729		vjudge1	A Difficult(y) Choice (BOI21_books)	C++17	0 / 100	1 ms	308 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define for1(i,j,k) for(int i=j;i<=k;i++)
#define for2(i,j,k) for(int i=j;i>=k;i--)
#define for3(i,j,k,l) for(int i=j;i<=k;i+=l)
#define bit(n,i) ((n>>i)&1)
#define all(x) x.begin(),x.end()
//#pragma GCC optimize("O2,unroll-loops")
//#pragma GCC target("avx,avx2,bmi,bmi2,sse,sse2,sse3,ssse3,sse4,popcnt")
//#define int long long
typedef long long ll;
typedef pair<int,int> pii;
typedef double ld;
typedef pair<ld,ld> pdd;
typedef pair<ll,ll> pll;
const ll maxn=1e6+69;
const ll offset=1e9;
const ll block_sz=317;
const ll inf=1e18;
const ll mod=1e9+7;

long long sum,a[maxn],m;
deque<int> gg;
//void __attribute__((noreturn)) __attribute__((format(printf, 1, 2))) result(const char *msg, ...)
//{
//    va_list args;
//    va_start(args, msg);
//    vfprintf(stderr, msg, args);
//    fprintf(stderr, "\n");
//    va_end(args);
//    exit(0);
//}
//
//namespace
//{
//    int N, K, S, sUsed;
//    long long A;
//    vector<long long> seq;
//}
//
//void impossible()
//{
//    result("Impossible (not checked): %d book(s) skimmed", sUsed);
//    exit(0);
//}
//
//long long skim(int pos)
//{
//    printf("skim(%d): ", pos);
//	if (pos<1 || pos>N) result("Invalid skim");
//    printf("%lld\n", seq[pos]);
//	sUsed++;
//	if (sUsed>S) result("Out of books to skim");
//    return seq[pos];
//}
//
//void answer(vector<int> v)
//{
//    printf("answer({");
//    for(int i = 0; i < (int) v.size(); ++i)
//    {
//        printf("%d", v[i]);
//        if(i + 1 != (int) v.size()) printf(", ");
//    }
//    printf("})\n");
//
//	if ((int) v.size() != K) result("Invalid answer");
//   	ll sum = 0;
//	for(auto x: v) {
//		if (x<1 || x>N) result("Invalid answer");
//		sum += seq[x];
//	}
//	if (sum < A || 2*A<sum) result("Wrong answer");
//
//	result("Correct: %d book(s) skimmed", sUsed);
//    exit(0);
//}

bool check(int mid,int k)
{
    a[mid]=skim(mid);
    gg.pb(mid);
    sum+=a[mid];
    while (gg.size()>k)
    {
        int x=a[gg.front()];
        sum-=x;
        gg.pop_front();
    }
    if (sum/gg.size()<= m) return true;
    else return false;
}
vector<int> take()
{
    vector<int> kk;
    while (!gg.empty())
    {
        kk.pb(gg.front());
        gg.pop_front();
    }
    return kk;
}
void solve(int n,int k,long long a,int s)
{
    m=(3*a/2)/k;
    int l=1,r=n,mid;
    while (l<=r)
    {
        int mid=l+r>>1;
        if (check(mid,k)) l=mid+1;
        else r= mid-1;
        if (gg.size()==k && sum>=a && sum <=2*a)
        {
            answer(take());
        }
    }
    impossible();
}
//int main()
//{
//    if(scanf("%d %d %lld %d", &N, &K, &A, &S) != 4)
//        result("Invalid input");
//
//    seq.resize(N + 1);
//    for(int i = 1; i <= N; ++i) {
//    	if(scanf("%lld", &(seq[i])) != 1) result("Invalid input");
//		if(i>1 && seq[i]<=seq[i-1]) result("Invalid input");
//   	}
//
//    solve(N, K, A, S);
//
//    result("No answer");
//}

Compilation message (stderr)

books.cpp: In function 'bool check(int, int)':
books.cpp:89:21: warning: comparison of integer expressions of different signedness: 'std::deque<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   89 |     while (gg.size()>k)
      |            ~~~~~~~~~^~
books.cpp:95:22: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'long long int' [-Wsign-compare]
   95 |     if (sum/gg.size()<= m) return true;
      |         ~~~~~~~~~~~~~^~~~
books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:114:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  114 |         int mid=l+r>>1;
      |                 ~^~
books.cpp:117:22: warning: comparison of integer expressions of different signedness: 'std::deque<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  117 |         if (gg.size()==k && sum>=a && sum <=2*a)
      |             ~~~~~~~~~^~~
books.cpp:111:17: warning: unused variable 'mid' [-Wunused-variable]
  111 |     int l=1,r=n,mid;
      |                 ^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20