Submission #749916

#	Time	Username	Problem	Language	Result	Execution time	Memory
749916		guagua0407	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	119 ms	5640 KiB

foehn_phenomena

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2e5+5;
ll a[mxn];


int main() {_
    int n,q,S,T;
    cin>>n>>q>>S>>T;
    for(int i=0;i<=n;i++){
        cin>>a[i];
    }
    for(int i=n;i>=1;i--){
        a[i]-=a[i-1];
    }
    ll ans=0;
    for(int i=1;i<=n;i++){
        if(a[i]>0){
            ans+=1ll*S*a[i];
        }
        else{
            ans+=1ll*T*a[i];
        }
    }
    for(int i=0;i<q;i++){
        int l,r,x;
        cin>>l>>r>>x;
        if(a[l]>0){
            ans-=1ll*S*a[l];
        }
        else{
            ans-=1ll*T*a[l];
        }
        a[l]+=x;
        if(a[l]>0){
            ans+=1ll*S*a[l];
        }
        else{
            ans+=1ll*T*a[l];
        }
        if(r<n){
            if(a[r+1]>0){
                ans-=1ll*S*a[r+1];
            }
            else{
                ans-=1ll*T*a[r+1];
            }
            a[r+1]-=x;
            if(a[r+1]>0){
                ans+=1ll*S*a[r+1];
            }
            else{
                ans+=1ll*T*a[r+1];
            }
        }
        cout<<-ans<<'\n';
    }
    return 0;
}
//maybe its multiset not set

Compilation message (stderr)

foehn_phenomena.cpp: In function 'void setIO(std::string)':
foehn_phenomena.cpp:12:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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