Submission #1334381

#TimeUsernameProblemLanguageResultExecution timeMemory
1334381yc11A Difficult(y) Choice (BOI21_books)C++20
Compilation error
0 ms0 KiB
#include <bits/stdc++.h>
#include "books.h"
using namespace std;
void solve(int N, int K, long long A, int S) {
    long long a = 1;
    long long b = N;
    vector<long long> n1;
    vector<int> pre;
    n1.assign(N,-1);
    while (a<b){
     
        long long x = (a+b)/2;
        n1[x-1] = skim(x);
        if (n1[x-1]>=A) b = x;
        else a = x+1;
    }

    long long ans;
    if (n1[b-1]==-1) n1[b-1] = skim(b);
    ans = n1[b-1];

  
    for (int i = 0;i<K-1;i++){

        if (n1[i]==-1) n1[i] = skim(i+1);
       
        ans = ans+n1[i];
   
    }
 
    if (ans=<2*A and ans>=A){
        vector<int> a;
        a.push_back(b);
        for (int i = 0;i<K-1;i++) a.push_back(i+1);
        answer(a);
        return;
    }
    if (ans>2*A){
        int b1 = b;
    ans = ans-n1[b-1];



    if (n1[K-1]==-1) n1[K-1] = skim(K);
    ans = ans+n1[K-1];
    int c = 0;
    b--;
    while (ans<A){
        if (c+K>=b+1) break;
        if (n1[b]==-1) n1[b]=skim(b+1);
        ans = ans-n1[c]+n1[b];

        c++;
        b--;
        if (c==K) break;
    }
    if (ans>=A and 2*A>=ans){
        vector<int> a;
        for (int i = c;i<K;i++) a.push_back(i+1);
        for (int i = b+1;i<b1;i++) a.push_back(i+1);
        answer(a);
        return;

    }
    }
    else{
       int b1 = b;



    int c = 0;
    b--;
    b--;
    while (ans<A){
        if (c+K>=b+1) break;
        if (n1[b]==-1) n1[b]=skim(b+1);
        ans = ans-n1[c]+n1[b];
    
        c++;
        b--;
        if (c==K) break;
    }

    if (ans>=A and 2*A>=ans){
      
        vector<int> a;
        for (int i = c;i<K-1;i++) a.push_back(i+1);
        for (int i = b+1;i<b1;i++) a.push_back(i+1);
        answer(a);
        return;

    }
    }
    impossible();
}

Compilation message (stderr)

books.cpp: In function 'void solve(int, int, long long int, int)':
books.cpp:31:13: error: expected primary-expression before '<' token
   31 |     if (ans=<2*A and ans>=A){
      |             ^