Submission #496000

#	Time	Username	Problem	Language	Result	Execution time	Memory
496000		Nimbostratus	Preokret (COCI19_preokret)	C++17	50 / 50	1 ms	204 KiB

preokret

#include "bits/stdc++.h"
#define endl '\n'
#define fi first
#define se second
constexpr int maxn = 2e5 + 5;
constexpr int inf = 2e9;
constexpr int mod = 1e9 + 7;
using namespace std;
using lint = long long;
using pii = pair<int, int>;

int n;
int a[maxn];
int g1, g2, d, turn;
int pre[maxn];
bool w1;

signed main() {
	#ifdef Local
	freopen("in.txt", "r", stdin);
	freopen("out.txt", "w", stdout);
	#endif
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> n;
	for(int i = 1; i <= n; i++)
		cin >> a[i];
	d = 1;
	for(int i = 1; i <= n; i++) {
		g1 += a[i] == 1;
		g2 += a[i] == 2;
		pre[i] = pre[i - 1];
		pre[i] += a[i] == 1 ? 1 : -1;
		d += g1 == g2;
	}
	for(int i = 1; i <= n; i++)
		for(int j = i; j <= n; j++) {
			if(pre[i] <= 0 && pre[j] <= 0 || pre[i] >= 0 && pre[j] >= 0)
				continue;
			int cur = j - i;
			int x = pre[i] > pre[j] ? -1 : 1;
			for(int k = i; k < j; k++)
				if(pre[k + 1] - pre[k] != x)
					cur = 0;
			turn = max(turn, cur);
		}
	cout << g1 << " " << g2 << endl;
	cout << d << endl;
	cout << turn << endl;

}

Compilation message (stderr)

preokret.cpp: In function 'int main()':
preokret.cpp:38:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   38 |    if(pre[i] <= 0 && pre[j] <= 0 || pre[i] >= 0 && pre[j] >= 0)
      |       ~~~~~~~~~~~~^~~~~~~~~~~~~~

• Subtask 1: 50 / 50