Submission #42246

#	Time	Username	Problem	Language	Result	Execution time	Memory
42246		yusufake	The Big Prize (IOI17_prize)	C++98	100 / 100	24 ms	2024 KiB

prize

#include<bits/stdc++.h> 
using namespace std; 
#include "prize.h"
 
#define _ int v, int tl, int tr, int l, int r
#define tm (tl + tr >> 1)
#define sol v+v,tl,tm,l,r 
#define sag v+v+1,tm+1,tr,l,r 
 
#define mp make_pair 
#define pb push_back 
#define st first 
#define nd second 
 
typedef long long ll; 
typedef pair < int , int > pp; 
const int mod = 1e9 + 7; 
const int N   = 2e5 + 5; 
 
int ans=-1;
 
void f(int l, int r, vector < int > x, vector < int > y){
	int m = l+r >> 1;
	if(ans != -1) return;
	if(x[0] + x[1] == 0) { ans = l; return; }
	if(y[0] + y[1] == 0) { ans = r; return; }
	if(l >= r-1) return;
	if(x[0] + x[1] == y[0] + y[1] && x[1] == y[1]) return; 
	if(x[0] + x[1] < y[0] + y[1]) { f(l+1,r,ask(l+1),y); return; }
    if(x[0] + x[1] > y[0] + y[1]) { f(l,r-1,x,ask(r-1)); return; }
    
	vector < int > a = ask(m);
	f(l,m,x,a); f(m,r,a,y);
}
 
int find_best(int n){
	vector < int > x = ask(0);
    vector < int > y = ask(n-1);
    f(0,n-1,x,y);
	return ans;
}

Compilation message (stderr)

prize.cpp: In function 'void f(int, int, std::vector<int>, std::vector<int>)':
prize.cpp:23:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m = l+r >> 1;
           ^

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