Submission #1113623

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1113623	2024-11-16T20:30:09 Z	epicci23	The Big Prize (IOI17_prize)	C++17	Compilation error	0 ms	0 KB

prize

#include "bits/stdc++.h"
#include "prize.h"
//#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;
 
const int BL = 10000;

int suf = -1;
vector<int> Cache = {-1, -1};
map<int,vector<int>> dp;
vector<bool> mark;

vector<int> Ask(int i){
  if( dp.count(i) ) return dp[i];
  return dp[i] = ask(i);
}
 
void Learn(int l,int r){

  if(l > r) return -1;

  if(l == r){
    mark[l] = 1;
    suf--;
    return;
  }

  int mid = (l + r) / 2;
  auto u = Ask(mid);

  if(u[1] == suf){
    Learn(mid + 1, r);
    return;
  }
  
  Learn(l, mid - 1);
  if(u[1] < suf) suf--;

  Learn(mid + 1, r);
  return;
}
 
int find_best(int n){
  mark.assign(n,0);
  int art = 0;
  bool no = 0;
  for(int i = 0; i <= 475; i++){
  	if(art == 5){
      Learn(i, n - 1);
      no = 1;
      break;
    }
    vector<int> x = Ask(i);
    if(x[0] + x[1] == 0) return i;
    if(x[0] + x[1] > Cache[0] + Cache[1]) art++;
    if(x[0] + x[1] >= Cache[0] + Cache[1]){
      Cache = x;
      suf = Cache[1];
    }
    else suf--;
  }
  
  if(no == 0) Learn(476, n - 1);

  for(auto x:dp) if(x.second[0] + x.second[1] == 0) return x.first;
  for(int i=0;i<n;i++){
    if(mark[i]==0) continue;
    vector<int> Cand = Ask(i);
    if(Cand[0] + Cand[1] == 0) return i;
  }

  assert(0);
  return -1;
}

Compilation message

prize.cpp: In function 'void Learn(int, int)':
prize.cpp:22:20: error: return-statement with a value, in function returning 'void' [-fpermissive]
   22 |   if(l > r) return -1;
      |                    ^~