Submission #1039972

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039972		khanhtb	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	88 ms	13284 KiB

foehn_phenomena

#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const ll mod = 998244353; 
const ll inf = 1e18;
const ll blocksz = 320;
const ll N = 2e5+8;
ll a[N],d[N],s,t;
int n,q;
ll ans = 0;
void update(int i, int x){
    if(i > n) return;
    if(d[i] > 0) ans -= d[i]*s*x;
    else ans -= d[i]*t*x;
}
void solve(){
    cin >> n >> q >> s >> t; 
    for(int i = 0; i <= n; i++) cin >> a[i];
    for(int i = 1; i <= n; i++){
        d[i] = a[i]-a[i-1];
        update(i,1);
    }
    while(q--){
        int l,r,x;cin >> l >> r >> x;
        update(l,-1);
        update(r+1,-1);
        d[l] += x;
        d[r+1] -= x;
        update(l,1);
        update(r+1,1);
        cout << ans << '\n';
    }
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen("test.inp", "r")) {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    int T = 1;
    // cin >> T;
    for (int i = 1; i <= T; i++) {
        solve();
        cout << '\n';
    }
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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