oj.uz

Submission #785730

# Submission time Handle Problem Language Result Execution time Memory
785730 2023-07-17T13:53:54 Z QwertyPi The Big Prize (IOI17_prize) C++14
20 / 100
 4 ms 344 KB 
#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

map<int, vector<int>> M, Li;
vector<int> self_ask(int i){
	if(!M.count(i)) M[i] = ask(i); vector<int> r = M[i];
	Li[r[0] + r[1]].push_back(i);
	return r;
}

vector<int> b;

bool failed = false, done = false, un = true;
mt19937 rng(0);
int cc, ans;
void solve(int l, int r, int lc, int rc){
	if(l > r || lc == rc) return;
	int L = (l + r) / 2, R = (l + r) / 2 + 1, F = 0;
	int c; vector<int> a;
	while(true){
		c = F ? R++ : L--; F ^= 1;
		a = self_ask(c);
		if(a[0] + a[1] == 0){
			done = true; failed = true; ans = c;
		}
		if(un || a[0] + a[1] > cc){
			failed = true; un = false; cc = a[0] + a[1];
			return;
		}
		if(a[0] + a[1] == cc || R - L - 1 == rc - lc){
			break;
		}
	}
	if(R - L + 1 == rc - lc) return;
	if(c == L + 1){
		solve(l, L, lc, a[0]); if(failed) return;
		solve(R, r, a[0] + (R - L - 2), rc); if(failed) return;
	}else{
		solve(l, L, lc, a[0] - (R - L - 2)); if(failed) return;
		solve(R, r, a[0], rc); if(failed) return;
	}
}

int find_best(int n) {
	cc = n;
	do{
		failed = false;
		solve(0, n - 1, 0, cc);
		if(done) break;
	}while(failed);
	if(done){
		return ans;
	}
}

Compilation message

prize.cpp: In function 'std::vector<int> self_ask(int)':
prize.cpp:8:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    8 |  if(!M.count(i)) M[i] = ask(i); vector<int> r = M[i];
      |  ^~
prize.cpp:8:33: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    8 |  if(!M.count(i)) M[i] = ask(i); vector<int> r = M[i];
      |                                 ^~~~~~
prize.cpp: In function 'int find_best(int)':
prize.cpp:56:1: warning: control reaches end of non-void function [-Wreturn-type]
   56 | }
      | ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 296 KB Output is correct
2 Correct 1 ms 208 KB Output is correct
3 Correct 1 ms 296 KB Output is correct
4 Correct 1 ms 208 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 1 ms 208 KB Output is correct
7 Correct 1 ms 308 KB Output is correct
8 Correct 0 ms 300 KB Output is correct
9 Correct 0 ms 208 KB Output is correct
10 Correct 0 ms 208 KB Output is correct

Subtask #2
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 1 ms 208 KB Output is correct
4 Correct 0 ms 292 KB Output is correct
5 Correct 1 ms 292 KB Output is correct
6 Correct 0 ms 300 KB Output is correct
7 Correct 1 ms 304 KB Output is correct
8 Correct 1 ms 304 KB Output is correct
9 Correct 0 ms 300 KB Output is correct
10 Correct 1 ms 312 KB Output is correct
11 Correct 1 ms 312 KB Output is correct
12 Correct 0 ms 304 KB Output is correct
13 Correct 3 ms 336 KB Output is correct
14 Incorrect 4 ms 336 KB answer is not correct
15 Halted 0 ms 0 KB -