Submission #977390

#	Time	Username	Problem	Language	Result	Execution time	Memory
977390		mariaclara	The Big Prize (IOI17_prize)	C++17	20 / 100	52 ms	2136 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mk make_pair
#define pb push_back
#define fr first
#define sc second

int find_best(int n) {
	int i = 0, at = 0, lolipop = 0;

	vector<pii> resp(n, mk(-1,-1));

	for(int i = 0; i < min(450,n); i++) {
		vector<int> aux = ask(i);
		resp[i] = {aux[0],aux[1]};
		lolipop = max(lolipop, aux[0] + aux[1]);
	}

	while(i < n) {
		// achar primeiro cara mais valioso doq um pirulito de indice maior que i
		int l = i, r = n-1;
		while(l <= r) {
			int mid = (l+r)/2;
			vector<int> aux;
			if(resp[mid] == mk(-1,-1)) aux = ask(mid), resp[mid] = {aux[0],aux[1]};
			else aux = {resp[mid].fr};
			if(aux[0] > at) r = mid-1;
			else l = mid+1;
		}

		while(r+1 < n) {
			vector<int> aux;
			if(resp[r+1] == mk(-1,-1)) aux = ask(r+1), resp[r+1] = {aux[0], aux[1]};
			else aux = {resp[r+1].fr, resp[r+1].sc};
			if(resp[r+1].fr + resp[r+1].sc == lolipop) break;
			r++;
		}

		i = r;
		while(i >= 0) {
			vector<int> aux;
			if(resp[i] == mk(-1,-1)) aux = ask(i), resp[i] = {aux[0], aux[1]};
			else aux = {resp[i].fr, resp[i].sc};
			if(aux[0] + aux[1] == 0) return i;
			if(aux[0] + aux[1] == resp[r+1].fr + resp[r+1].sc or aux[0] == 0) break;
			i--;
		}

		i = r+1;
		at = resp[r+1].fr;
	}
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:18:31: warning: control reaches end of non-void function [-Wreturn-type]
   18 |  vector<pii> resp(n, mk(-1,-1));
      |                               ^

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80