Submission #870141

#	Time	Username	Problem	Language	Result	Execution time	Memory
870141		nghia0912	Sjeckanje (COCI21_sjeckanje)	C++17	15 / 110	2024 ms	484 KiB

Main

#define COPYRIGHT CODE BY TRINH TUAN NGHIA
#include<bits/stdc++.h>
#define Boost ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long
#define endl "\n"
#define st first
#define nd second
#define ii pair <ll,ll>
#define iii pair <ll,ii>
#define iiii pair <ii,ii>
#define pb push_back
#define NAME "recipe"
using namespace std;
const int N = 2e5 + 10;
const int Nsub1 = 210;
const int Nsub2 = 3e3 + 10;
int n,q ;
long long  dp[3010];
ll a[N];

void inp (){
    cin >> n >> q;
    for (int i = 1;i <= n; ++i){
        cin >> a[i];
    }
}
void reset(){
    for (int i =1 ; i <= n; ++i)dp[i] = 0;
}
void sub1(){
    while (q--){
        reset();
        int l, r, x;
        cin >> l >> r >> x;
        for (int i = l; i <= r; ++i){
            a[i] += x;
        }
        for (int i = 1; i <= n; ++i){
            ll minn = a[i];
            ll maxx = a[i];
            for (int j = i; j >= 1; --j){
                minn = min(minn, a[j]);
                maxx = max(maxx, a[j]);
                dp[i] = max({dp[i], dp[j - 1] + a[i] - minn, dp[j - 1] + maxx - a[i]});
//                if (i == 2 and j == 1)cout << minn << " " << maxx << "\n";
            }
//            cout << dp[i] << " ";
        }
//        cout << "\n";
//        for (int i =1 ; i <= n; ++i)cout << dp[i] << " ";
//        cout << "\n";
        cout << dp[n] << "\n";
    }

}
void sub2(){
    while (q--){
        reset();
        int l, r, x;
        cin >> l >> r >> x;
        for (int i = l; i <= r; ++i){
            a[i] += x;
        }
        ll minn = 1e18;
        ll maxx = 0;
        ll minndp = 1e18;
        ll maxxdp = -1e18;
        for (int i = 1; i <= n; ++i){
            dp[i] = max({dp[i], a[i] - minndp, maxxdp - a[i]});
            minndp = min(minndp, a[i] - dp[i - 1]);
            maxxdp = max(maxxdp, dp[i - 1] + a[i]);
            //cout << i << " " << dp[i] << " " << minndp << " " << maxxdp << endl;
        }
        cout << dp[n] << endl;
    }
}
void solve(){
    sub1();
//        sub2();
}
signed main (){
    if (fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".ans", "w", stdout);
    }
    Boost;
    inp();
    solve();
}
/*
input

*/

/*
output

*/

Compilation message (stderr)

Main.cpp: In function 'void sub2()':
Main.cpp:64:12: warning: unused variable 'minn' [-Wunused-variable]
   64 |         ll minn = 1e18;
      |            ^~~~
Main.cpp:65:12: warning: unused variable 'maxx' [-Wunused-variable]
   65 |         ll maxx = 0;
      |            ^~~~
Main.cpp: In function 'int main()':
Main.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen(NAME".ans", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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