Submission #50272

#	Time	Username	Problem	Language	Result	Execution time	Memory
50272		Mamnoon_Siam	The Big Prize (IOI17_prize)	C++17	100 / 100	60 ms	5436 KiB

prize

//#pragma GCC optimize("Ofast,unroll-loops,no-stack-protector")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;

#define debug(s) cout<< #s <<" = "<< s <<endl
#define all(v) (v).begin(), (v).end()
#define KeepUnique(v) (v).erase( unique(all(v)), v.end() )
#define MEMSET(a,val) memset(a, val, sizeof a)
#define PB push_back
#define endl '\n'

inline int myrand(int l, int r) {
	int ret = rand(); ret <<= 15; ret ^= rand();
	if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
	return ret;
}
template <typename F, typename S>
ostream& operator << (ostream& os, const pair< F, S>& p) {
    return os<<"(" <<p.first<<", "<<p.second<<")";
}

const int maxn = 200010;

vector<int> memo[maxn];
int mx_tot = 0;
vector<int> blocks;

int Left(int i) {
	if(memo[i].empty()) memo[i] = ask(i);
	return memo[i][0];
}
int Total(int i) {
	if(memo[i].empty()) memo[i] = ask(i);
	return memo[i][0] + memo[i][1];
}
bool IsThere(int i, int j) {
	if(Total(j) < mx_tot) return true;
	return (Left(j) - Left(i)) > 0;
}
bool Thicc(int i) {
	return Total(i) < mx_tot;
}

int NextThicc(int i) {
	if(Thicc(i)) return i;
	int it = lower_bound(all(blocks), i) - blocks.begin();
	while(!IsThere(i, blocks[it])) it++;
	int d = max((it == 0 ? -1 : blocks[it-1]), i);
	for(int j = 25; j >= 0; j--) {
		if(d + (1 << j) >= blocks[it]) continue;
		if(!IsThere(i, d + (1 << j)))
			d += (1 << j);
	} return d + 1;
}

int find_best(int n) { int debug = 0;
	if(!debug) if(n <= 5000)
		for(int i = 0; i < n; i++)
			if(Total(i) == 0)
				return i;

	int k = 782; int sz = n / k;
	for(int i = sz; i < n; i += sz) {
		blocks.push_back(i);
	} if(blocks.back() != n-1) blocks.push_back(n-1);
	for(int b : blocks) mx_tot = max(mx_tot, Total(b));
	int now = 0;
	while(true) {
		now = NextThicc(now);
		if(Total(now) == 0) return now;
		now++;
	}
}

Compilation message (stderr)

prize.cpp: In function 'int myrand(int, int)':
prize.cpp:17:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
  ^~
prize.cpp:17:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  if(ret < 0) ret = -ret; ret %= (r-l+1); ret += l;
                          ^~~

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