Submission #1040457

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040457		Requiem	Sjeckanje (COCI21_sjeckanje)	C++17	55 / 110	21 ms	656 KiB

Main

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define fast ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#define MOD 1000000007
#define inf 1e18
#define fi first
#define se second
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define FORD(i,a,b) for(int i=a;i>=b;i--)
#define sz(a) ((int)(a).size())
#define endl '\n'
#define pi 3.14159265359
#define TASKNAME ""
template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }
using namespace std;
typedef pair<int,int> ii;
typedef pair<int,ii> iii;
typedef vector<int> vi;

int n, q;

namespace subtask2{
    bool check(){
        return n <= 3000 and q <= 3000;
    }

    int preMax[3003], preMin[3030], a[3030], dp[3030];

    void update(int l, int r, int x){
         for(int i = l; i <= r; i++){
             a[i] += x;
         }
    }

    int get(){

        memset(dp, 0, sizeof(dp));
        memset(preMax, -0x3f, sizeof(preMax));
        memset(preMin, -0x3f, sizeof(preMin));
        dp[0] = 0;
        preMax[0] = dp[0] + a[1];
        preMin[0] = dp[0] - a[1];
        for(int i = 1; i <= n; i++){
            maximize(dp[i], preMax[i - 1] - a[i]);
            maximize(dp[i], preMin[i - 1] + a[i]);

            preMax[i] = max(preMax[i - 1], dp[i] + a[i + 1]);
            preMin[i] = max(preMin[i - 1], dp[i] - a[i + 1]);
        }
        return dp[n];
    }
    void solve(){
        for(int i = 1; i <= n; i++){
            cin >> a[i];
        }

        for(int i = 1; i <= q; i++){
            int l, r, x;
            cin >> l >> r >> x;
            update(l, r, x);
            cout << get() << endl;
        }
    }
}
main()
{
    fast;
    if (fopen(TASKNAME".inp","r")){
        freopen(TASKNAME".inp","r",stdin);
        freopen(TASKNAME".out","w",stdout);
    }
    cin >> n >> q;
    if (subtask2::check()) return subtask2::solve(), 0;
}
/**
Warning:
- MLE / TLE?
- Gioi han mang?
- Gia tri max phai luon gan cho -INF
- long long co can thiet khong?
- tran mang.
- code can than hon
- Nho sinh test de tranh RTE / TLE

--> Coi lai truoc khi nop
**/

Compilation message (stderr)

Main.cpp:67:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   67 | main()
      | ^~~~
Main.cpp: In function 'int main()':
Main.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(TASKNAME".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen(TASKNAME".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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