Submission #292918

#	Time	Username	Problem	Language	Result	Execution time	Memory
292918		Saboon	The Big Prize (IOI17_prize)	C++17	Compilation error	0 ms	0 KiB

prize

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

int Max = 0;

int solve(int l, int r, int cnt, int pre = 0, int suf = 0){
    if (cnt == r-l or l >= r)
        return -1;
    if (l+1 == r){
        vector<int> res = ask(l);
        if (res[0]+res[1] == 0)
            return l;
        return -1;
    }
    for (int mid = (l+r)>>1; mid < r; mid++){
        vector<int> res = ask(mid);
        if (res[0]+res[1] == 0)
            return mid;
        if (res[0]+res[1] == Max){
            int ret = solve(l,mid,res[0]-pre, pre, res[1]+1);
            if (ret != -1)
                return ret;
            return solve(mid+1, r, res[1]-suf, res[0]+1, suf);
        }
    }
    for (int mid = ((l+r)>>1)-1; mid >= l; mid--){
        vector<int> res = ask(mid);
        if (res[0]+res[1] == 0)
            return mid;
        if (res[0]+res[1] == Max){
            int ret = solve(l,mid,res[0]-pre, pre, res[1]+1);
            if (ret != -1)
                return ret;
            return solve(mid+1, r, res[1]-suf, res[0]+1, suf);
        }
    }
    return -1;
}

int find_best(int n){
    if (n <= 50000){
        for(int i = 0; i < n; i++) {
            vector<int> res = ask(i);
            if(res[0] + res[1] == 0)
                return i;
        }
    }
    for (int i = 0; i < min(n,500); i++){
        vector<int> res = ask(i);
        Max = max(Max, res[0]+res[1]);
        if (res[0] + res[1])
            return i;
    }
    return solve(0, n, n-Max);
}

Compilation message (stderr)

prize.cpp: In function 'int solve(int, int, int, int, int)':
prize.cpp:12:27: error: 'ask' was not declared in this scope
   12 |         vector<int> res = ask(l);
      |                           ^~~
prize.cpp:18:27: error: 'ask' was not declared in this scope
   18 |         vector<int> res = ask(mid);
      |                           ^~~
prize.cpp:29:27: error: 'ask' was not declared in this scope
   29 |         vector<int> res = ask(mid);
      |                           ^~~
prize.cpp: In function 'int find_best(int)':
prize.cpp:45:31: error: 'ask' was not declared in this scope
   45 |             vector<int> res = ask(i);
      |                               ^~~
prize.cpp:51:27: error: 'ask' was not declared in this scope
   51 |         vector<int> res = ask(i);
      |                           ^~~