Submission #585094

#	Time	Username	Problem	Language	Result	Execution time	Memory
585094		keta_tsimakuridze	Progression (NOI20_progression)	C++14	0 / 100	77 ms	6744 KiB

Progression

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define f first
#define s second
#define endl "\n"
const int N = 2e5 + 5, mod = 1e9 + 7; //!
int t, d[N], a[N];
main() {
//	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	int n, q;
	cin >> n >> q;
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
		if(i > 2) {
			d[i - 2] = a[i] - 2 * a[i - 1] + a[i - 2];
		}
	}

	for(int i = 1; i <= q; i++) {
		int t;
		cin >> t;
		if(t < 3) {
			int l, r, s, c;
			cin >> l >> r >> s >> c;
			if(t == 1)  {
				for(int j = l; j <= r; j++) a[j] += (j - l) * c + s;

				for(int j = l ; j <= r - 2; j++) {
					d[j] += c * 2;
				}
				d[l - 1] += s + c;
				if(l > 1)
				d[l - 2] += s;
				if(l < r)
				d[r - 1] -= s + (r - l - 1) * c;
				d[r] -= s + (r - l) * c;
			}
			else {
				for(int j = l; j <= r; j++) a[j] = (j - l) * c + s;
				for(int j = l; j <= r - 2; j++) {
					d[j] = c * 2;
				}
				d[l - 1] = a[l + 1] - a[l - 1];
				if(l >= 2)
				d[l - 2] = a[l] - a[l - 2];
				d[r - 1] = a[r + 1] - a[r - 1];
				d[r] = a[r + 2] - a[r];
				
			}
				for(int j = 2; j <= n; j++) {
					d[j - 2] = a[j] + a[j - 2] - 2 * a[j - 1];
				}
			continue; 
		}
		int l, r;
		cin >> l >> r;
		int ans = 3;
		ans = min(ans, r - l + 1);
		r -= 2;
		for(int k = l; k <= r; k++) { 
			int j = k - 1;
			while(j < r  && d[k] == d[j + 1]) ++j;
			ans = max(ans, j - k + 3);
			k = j;
		}
		cout << ans << endl;
	}
}

Compilation message (stderr)

Progression.cpp:10:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   10 | main() {
      | ^~~~

• Subtask 1: 0 / 9
• Subtask 2: 0 / 15
• Subtask 3: 0 / 35
• Subtask 4: 0 / 11
• Subtask 5: 0 / 13
• Subtask 6: 0 / 17