Submission #1069879

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069879		n1k	Sjeckanje (COCI21_sjeckanje)	C++17	55 / 110	2071 ms	11092 KiB

Main

#include <bits/stdc++.h>

#if defined(LOCAL)
#include "debug.cpp"
#else
#define debug(x...) 0
#endif // LOCAL

using namespace std;

using ll = long long;

#define all(a) (a).begin(), (a).end()

void solve(){
	int n, q; cin >> n >> q;
	vector<ll> a(n);
	for(int i=0; i<n; i++) cin >> a[i];
	auto get = [&](vector<ll> a){
		vector<ll> dp(n+1);
		for(int i=0; i<n; i++){
			ll mn=a[i], mx = a[i];
			for(int j=i; j<n; j++){
				mn = min(mn, a[j]);
				mx = max(mx, a[j]);
				dp[j+1]=max(dp[j+1], dp[i]+mx - mn);
			}
		}
		return dp[n];
	};
	auto fast = [&](vector<ll> a){
		vector<ll> d, dp(n+1);
		for(int i=0; i+1<n; i++){
			d.push_back(a[i+1] - a[i]);
		}
		for(int i=0; i<d.size(); i++){
			// not pick
			dp[i+1] = max(dp[i+1], dp[i]);
			// pick
			int sgn = (i+1 == d.size() ? 0 : signbit(d[i]) != signbit(d[i+1]));
			dp[i+1+sgn] = max(dp[i+1+sgn], dp[i] + abs(d[i]));
		}
		return dp[d.size()];
	};
	while(q--){
		ll l, r, add;
		cin>>l>>r>>add;
		l--, r--;
		for(int i=l; i<=r;i++) a[i]+=add;
		cout<<fast(a)<<endl;
	}
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
	int t=1; //cin >> t;
	while(t--) solve();
}

Compilation message (stderr)

Main.cpp: In lambda function:
Main.cpp:36:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |   for(int i=0; i<d.size(); i++){
      |                ~^~~~~~~~~
Main.cpp:40:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |    int sgn = (i+1 == d.size() ? 0 : signbit(d[i]) != signbit(d[i+1]));
      |               ~~~~^~~~~~~~~~~
Main.cpp: In function 'void solve()':
Main.cpp:19:7: warning: variable 'get' set but not used [-Wunused-but-set-variable]
   19 |  auto get = [&](vector<ll> a){
      |       ^~~

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 0 / 55