Submission #408526

#	Time	Username	Problem	Language	Result	Execution time	Memory
408526		Kevin_Zhang_TW	The Big Prize (IOI17_prize)	C++17	20 / 100	187 ms	7712 KiB

prize

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif
 
#include "prize.h"
 
const int MAX_N = 300010;
 
vector<int> qry(int id) {
	static vector<int> mem[MAX_N];
	if (mem[id].size()) return mem[id];
	return mem[id] = ask(id);
}
 
int sum(int id) {
	return qry(id)[0] + qry(id)[1];
}
int solve(int L, int R, int cnt) {
	while (L <= R) {
		if (sum(L) < cnt) {
			if (sum(L) == 0) return L;
			++L;
			continue;
		}
		cnt = sum(L);
 
		int l = L, r = R, m;
 
		while (l < r) {
			m = (l + r >> 1)+1;
			if (sum(m) > cnt) {
				cnt = sum(m);
				break;
			}
			if (sum(m) == 0) return m;
			if (sum(m) < cnt) {
				int a = solve(L, m-1, cnt);
				if (a != -1) return a;
				int b = solve(m+1, R, cnt);
				if (b != -1) return b;
				return -1;
			}
			if (qry(m)[0] > qry(L)[0]) {
				r = m-1;
			}
			else 
				l = m;
		}
		if (sum(L) != cnt) continue;
		L = l + 1;
	}
	return -1;
}
 
int find_best(int n) {
	return solve(0, n-1, 1);
}

Compilation message (stderr)

prize.cpp: In function 'int solve(int, int, int)':
prize.cpp:43:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   43 |    m = (l + r >> 1)+1;
      |         ~~^~~

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