Submission #1291231

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291231		flo	Sjeckanje (COCI21_sjeckanje)	C++20	110 / 110	297 ms	36200 KiB

Main

#include <bits/stdc++.h>
#define task "testing"
#define int long long
#define multitest 0
using namespace std;

struct Data {
	int val, a[2][2];
	
	Data() {
		val = a[0][0] = a[0][1] = a[1][0] = a[1][1] = 0;
	}
};

const int N = 2e5;

int a[N+5];

Data st[4*N+5];

Data merge(Data u, Data v) {
	Data res;
	
	for (int x = 0; x < 2; x++) {
		for (int y = 0; y < 2; y++) {
			for (int z = 0; z < 2; z++) {
				res.a[x][y] = max(res.a[x][y], u.a[x][z]+v.a[z][y]);
			}
		}
	}
	
	return res;
}

void upd(int nd, int lf, int rt, int u, int v) {
	if (u < lf || rt < u) return;
	
	if (lf == rt) {
		st[nd].val += v;
		
		if (st[nd].val < 0) {
			st[nd].a[0][0] = -st[nd].val, st[nd].a[0][1] = st[nd].a[1][0] = st[nd].a[1][1] = 0;
		}
		else {
			st[nd].a[0][0] = st[nd].a[0][1] = st[nd].a[1][0] = 0, st[nd].a[1][1] = st[nd].val;
		}
		
		return;
	}
	
	int mid = (lf+rt)/2;
	
	upd(nd*2, lf, mid, u, v);
	upd(nd*2+1, mid+1, rt, u, v);
	
	st[nd] = merge(st[nd*2], st[nd*2+1]);
}

void flo(int ID) {
	int n, q; cin >> n >> q;
	
	for (int x = 1; x <= n; x++) cin >> a[x];
	
	for (int x = 1; x < n; x++) {
		upd(1, 1, n-1, x, a[x+1]-a[x]);
	}
	
	while (q--) {
		int l, r, x; cin >> l >> r >> x;
		
		upd(1, 1, n-1, l-1, x);
		upd(1, 1, n-1, r, -x);
		
		int ans = 0;
		
		for (int x = 0; x < 2; x++) {
			for (int y = 0; y < 2; y++) {
				ans = max(ans, st[1].a[x][y]);
			}
		}
		
		cout << ans << "\n";
	}
}
	
signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}
	
	int TCS = 1, ID = 1;

	if (multitest) {
		cin >> TCS;
	}

	while (TCS--) flo(ID++);

	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:91:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |                 freopen(task".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:92:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   92 |                 freopen(task".out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 55 / 55