Submission #287379

#	Time	Username	Problem	Language	Result	Execution time	Memory
287379		BeanZ	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	137 ms	13176 KiB

foehn_phenomena

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 2e5 + 5;
ll a[N], b[N];
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("VietCT.INP", "r")){
                freopen("VietCT.INP", "r", stdin);
                freopen("VietCT.OUT", "w", stdout);
        }
        ll n, q, s, t;
        cin >> n >> q >> s >> t;
        ll ans = 0;
        for (int i = 0; i <= n; i++){
                cin >> a[i];
                if (i > 0){
                        b[i] = a[i] - a[i - 1];
                        if (b[i] <= 0) ans = ans - b[i] * t;
                        else ans = ans - b[i] * s;
                }
        }
        while (q--){
                ll l, r, x;
                cin >> l >> r >> x;
                if (b[l] <= 0) ans = ans + b[l] * t;
                else ans = ans + b[l] * s;
                b[l] = b[l] + x;
                if (b[l] <= 0) ans = ans - b[l] * t;
                else ans = ans - b[l] * s;
                if (r != n){
                        if (b[r + 1] <= 0) ans = ans + b[r + 1] * t;
                        else ans = ans + b[r + 1] * s;
                        b[r + 1] = b[r + 1] - x;
                        if (b[r + 1] <= 0) ans = ans - b[r + 1] * t;
                        else ans = ans - b[r + 1] * s;
                }
                cout << ans << endl;
        }
}
/*
*/

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:13:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   13 |                 freopen("VietCT.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:14:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |                 freopen("VietCT.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60