Submission #1088980

#	Time	Username	Problem	Language	Result	Execution time	Memory
1088980		Piokemon	A Difficult(y) Choice (BOI21_books)	C++17	100 / 100	1 ms	600 KiB

books

#include <bits/stdc++.h>

#include "books.h"

using namespace std;
//
// --- Sample implementation for the task books ---
//
// To compile this program with the sample grader, place:
//     books.h books_sample.cpp sample_grader.cpp
// in a single folder and run:
//     g++ books_sample.cpp sample_grader.cpp
// in this folder.
//

void solve(int N, int K, long long A, int S) {
    int pocz,kon,srod;
    pocz=1;
    kon=N;
    while(pocz<kon){
        srod=(pocz+kon)/2;
        if (skim(srod)>=A)kon=srod;
        else pocz=srod+1;
    }
    if (pocz<=K-1)impossible();
    long long int wart = skim(pocz);
    vector<long long> val;
    vector<int> ind;
    for (int x=1;x<=min(K,pocz);x++)val.push_back(skim(x));
    for (int x=max(K+1,pocz-K+1);x<=pocz;x++)val.push_back(skim(x));
    for (int x=1;x<=min(K,pocz);x++)ind.push_back(x);
    for (int x=max(K+1,pocz-K+1);x<=pocz;x++)ind.push_back(x);
    long long suma=0;
    for (int x=0;x<K-1;x++)suma+=val[x];
    suma+=wart;
    if (A<=suma && suma<=2*A){
        vector<int> odp;
        for (int x=0;x<K-1;x++)odp.push_back(ind[x]);
        odp.push_back(pocz);
        answer(odp);return;
    }
     suma=0;
    for (int x=0;x<K;x++)suma+=val[x];
    for (int x=K;x<val.size();x++){
        if (A<=suma && suma<=2*A){
            vector<int> odp;
            for (int y=x-K;y<x;y++)odp.push_back(ind[y]);
            answer(odp); return;
        }
        suma+=val[x];
        suma-=val[x-K];
    }
    if (A<=suma && suma<=2*A){
        vector<int> odp;
        for (int y=val.size()-K;y<val.size();y++)odp.push_back(ind[y]);
        answer(odp); return;
    }
    impossible();
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for (int x=K;x<val.size();x++){
      |                  ~^~~~~~~~~~~
books.cpp:55:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for (int y=val.size()-K;y<val.size();y++)odp.push_back(ind[y]);
      |                                 ~^~~~~~~~~~~

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