Submission #330485

#	Time	Username	Problem	Language	Result	Execution time	Memory
330485		maximath_1	The Big Prize (IOI17_prize)	C++11	90 / 100	125 ms	512 KiB

prize

#include "prize.h"
#include <vector>
using namespace std;

int find_best(int n) {
	int loli = -1, mx = 0, pre = 0;
	for(int i = 0; i < 474; i ++){
		vector<int> v = ask(i);
		if(v[0] + v[1] == 0) return i;
		if(v[0] + v[1] > mx){
			mx = v[0] + v[1];
			loli = i;
			pre = v[0];
		}
	}

	for(;;){
		int lf = loli + 1, rg = n - 1;
		int ans;
		for(int md; lf <= rg;){
			md = (lf + rg) / 2;
			vector<int> v = ask(md);
			if(v[0] + v[1] == 0) return md;
			if(v[0] + v[1] == mx && v[0] == pre) lf = md + 1;
			else rg = md - 1;
			if(v[0] + v[1] != mx) ans = md;
		}

		for(int i = ans; i < n; i ++){
			vector<int> v = ask(i);
			if(v[0] + v[1] == 0) return i;
			if(v[0] + v[1] == mx){
				loli = i; pre = v[0];
				break;
			}
		}
	}

	return 0;
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:19:7: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 |   int ans;
      |       ^~~

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80