Submission #549176

#	Time	Username	Problem	Language	Result	Execution time	Memory
549176		esomer	The Big Prize (IOI17_prize)	C++17	92.81 / 100	53 ms	1180 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>
 
using namespace std;
 
vector<int> v;
vector<int> nw;
int a[] = {475, 27, 5, 1};
int mx;
 
void bin(int l, int r, int lx, int rx){
	if(v.size() == mx) return;
	if(l == r){
		nw.push_back(v[l]); return;
	}
	int mid = (l + r) / 2;
	vector<int> rep = ask(v[mid]); //
	int curr = mid;
	while(rep[0] + rep[1] != mx && curr > l){
		nw.push_back(v[curr]);
		curr--;
		rep = ask(v[curr]); //
	}
	if(rep[0] + rep[1] != mx) nw.push_back(v[curr]);
	if(lx + rep[1] < mx && l < curr) bin(l, curr - 1, lx, rep[1]);
	curr = mid;
	while(rep[0] + rep[1] != mx && curr < r){
		nw.push_back(v[curr]);
		curr++;
		rep = ask(v[curr]); // 
	}
	if(rep[0] + rep[1] != mx) nw.push_back(v[curr]);
	if(rx + rep[0] < mx && r > curr) bin(mid + 1, r, rep[0], rx);
 
}
 
int find_best(int n) {
	v.resize(n);
	for(int i = 0; i < n; i++){
		v[i] = i;
	}
	int curr = 0;
    int t = 0;
	while(v.size() > 1 && t < 1){
		mx = 0;
		for(int i = 0; i < a[curr] && i < v.size(); i++){
			vector<int> rep = ask (v[i]); //
			mx = max(mx, rep[0] + rep[1]);
			if(rep[0] + rep[1] == 0) return v[i];
		}
		bin(a[curr], v.size() - 1, 0, 0);
		curr++;
		v = nw;
		sort(v.begin(), v.end());
		nw.clear();
        t++;
	}
	for(int x : v){
        vector<int> rep = ask(x);
        if(rep[0] + rep[1] == 0) return x;
    }
}

Compilation message (stderr)

prize.cpp: In function 'void bin(int, int, int, int)':
prize.cpp:12:14: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   12 |  if(v.size() == mx) return;
      |     ~~~~~~~~~^~~~~
prize.cpp: In function 'int find_best(int)':
prize.cpp:46:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |   for(int i = 0; i < a[curr] && i < v.size(); i++){
      |                                 ~~^~~~~~~~~~
prize.cpp:62:1: warning: control reaches end of non-void function [-Wreturn-type]
   62 | }
      | ^

• Subtask 1: 20 / 20
• Subtask 2: 72.81 / 80