Submission #954734

#	Time	Username	Problem	Language	Result	Execution time	Memory
954734		Itamar	Gap (APIO16_gap)	C++14	0 / 100	20 ms	3040 KiB

gap

#include "gap.h"
using namespace std;
#define ll long long
#include <vector>
#define vll vector<ll>
#include <algorithm>
long long findGap(int T, int N)
{
	if (T == 1) {
		ll a = -1, b = 1e18+1;
		vll v;
		for (int it = 0; it < (N + 1) / 2; it++) {
			ll *at, *bt;
			MinMax(a+1, b-1, at, bt);
			a = *at, b = *bt;
			v.push_back(a); v.push_back(b);
		}
		sort(v.begin(), v.end());
		ll ans = 0;
		for (int i = 0; i < N - 1; i++)ans = max(ans, v[i + 1] - v[i]);
		return ans;
	}
	else {
		ll* a, * b;
		MinMax(0, 1e18, a, b);
		vll v;
		ll d = (b - a+N-2) / (N - 1);
		for (int i = *a; i < *b; i += d + 1) {
			ll* c, * k;
			MinMax(i, i + d, c, k);
			v.push_back(*c); v.push_back(*k);
		}
		sort(v.begin(), v.end());
		ll ans = d;
		for (int i = 0; i < v.size()-1; i++) {
			if (v[i] > -1) {
				ans = max(ans, v[i + 1] - v[i]);
			}
		}
	}
}

Compilation message (stderr)

gap.cpp: In function 'long long int findGap(int, int)':
gap.cpp:35:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   for (int i = 0; i < v.size()-1; i++) {
      |                   ~~^~~~~~~~~~~~
gap.cpp:41:1: warning: control reaches end of non-void function [-Wreturn-type]
   41 | }
      | ^
gap.cpp:14:10: warning: 'at' may be used uninitialized in this function [-Wmaybe-uninitialized]
   14 |    MinMax(a+1, b-1, at, bt);
      |    ~~~~~~^~~~~~~~~~~~~~~~~~
gap.cpp:14:10: warning: 'bt' may be used uninitialized in this function [-Wmaybe-uninitialized]
gap.cpp:25:9: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   25 |   MinMax(0, 1e18, a, b);
      |   ~~~~~~^~~~~~~~~~~~~~~
gap.cpp:25:9: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
gap.cpp:30:10: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
   30 |    MinMax(i, i + d, c, k);
      |    ~~~~~~^~~~~~~~~~~~~~~~
gap.cpp:30:10: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70