Submission #896826

#	Time	Username	Problem	Language	Result	Execution time	Memory
896826		sysia	The Big Prize (IOI17_prize)	C++17	20 / 100	5 ms	4052 KiB

prize

//Sylwia Sapkowska
#include <bits/stdc++.h>
#include "prize.h"
#pragma GCC optimize("O3", "unroll-loops")
using namespace std;

void __print(int x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << "'" << x << "'";}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ", "; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? ", " : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef LOCAL
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

typedef pair<int, int> T;

// mt19937 rng(chrono::steady_clock().time_since_epoch().count());
// int p(int a, int b){
// 	return a + rng()%(b-a+1);
// }

int find_best(int n) {
	if (n <= 5000){
		for (int i = 1; i<=n; i++){
			auto x = ask(i-1);
			if (max(x[0], x[1]) == 0){
				return i-1;
			}
		}
		assert(false);
	}	
	//duzo elementow
	int curr = 0, pos = 0;
	for (int rep = 1; rep <= 470; rep++){
		auto x = ask(rep-1);
		if (max(x[0], x[1]) == 0){
			return rep-1;
		}
		int s = x[0] + x[1];
		if (s > curr){
			curr = s;
			pos = rep;
		}
	}
	debug(pos);
	int left = n-curr; //tyle nie najgorszych elementow
	//powinno byc left <= 500
	vector<int>where, pref(n+1);
	vector<bool>vis(n+1);
	for (int i = 1; i<=left; i++){
		where.clear();
		pref.assign(n+1, 0);
		for (int rep = 0; rep <= n; rep++){
			if (!vis[rep]){
				where.emplace_back(rep);
			}
			if (vis[rep]) pref[rep]++;
			if (rep) pref[rep] += pref[rep-1];
		}
		int l = 1, r = (int)where.size()-1;
		int ans = -1;
		while (r >= l){
			int m = (l+r)/2;
			auto x = ask(where[m]-1);
			if (x[0] + x[1] == 0) return where[m]-1;
			if (x[0] + x[1] < pos){
				ans = m;
				break;
			}
			//najgorszy
			int left = pref[where[m]];
			if (x[0] == left){
				l = m+1;
			} else {
				r = m-1;
			}
		}
		assert(ans != -1);
		vis[ans] = 1;
		debug(ans);
	}
	assert(false);
}

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