Submission #216324

#	Time	Username	Problem	Language	Result	Execution time	Memory
216324		KoalaMuch	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	0 / 100	631 ms	20744 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
const int N = 2e5+5;
int s,t;
struct A
{
    int l,r;
    long long ans;
};
A sm[N*4];
long long lz[N*4];
void apply(int now,int l,int r)
{
    if(!lz[now])    return ;
    sm[now].l+=lz[now];
    sm[now].r+=lz[now];
    if(l!=r)    lz[now<<1]+=lz[now],lz[now<<1|1]+=lz[now];
    lz[now] = 0;
}
A Merge(A a,A b)
{
    if(a.r<b.l) return {a.l,b.r,a.ans+b.ans-s*(b.l-a.r)};
    else        return {a.l,b.r,a.ans+b.ans+t*(a.r-b.l)};
}
void upd(int l,int r,int ll,int rr,int now,int v)
{
    apply(now,l,r);
    if(l>rr||r<ll)return ;
    if(l>=ll&&r<=rr)
    {
        lz[now]+=v;
        apply(now,l,r);
        return ;
    }
    int mid = (l+r) >> 1;
    upd(l,mid,ll,rr,now<<1,v),upd(mid+1,r,ll,rr,now<<1|1,v);
    sm[now] = Merge(sm[now<<1],sm[now<<1|1]);
//    printf("%d %d %d %d %lld\n",l,r,sm[now].l,sm[now].r,sm[now].ans);
}
int main()
{
    int n,q,l,r,x;
    scanf("%d %d %d %d",&n,&q,&s,&t);
    for(int i=0;i<=n;i++)   scanf("%d",&x),upd(0,n,i,i,1,x);
//    printf("%lld\n",sm[1].ans);
    while(q--)
    {
        scanf("%d %d %d",&l,&r,&x);
        upd(0,n,l,r,1,x);
        printf("%lld\n",sm[1].ans);
    }
    return 0;
}
/*
3 5 1 2
0 4 1 8
1 2 2
1 1 -2
2 3 5
1 2 -1
1 3 5
*/

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d %d",&n,&q,&s,&t);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:44:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=0;i<=n;i++)   scanf("%d",&x),upd(0,n,i,i,1,x);
                             ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d",&l,&r,&x);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 30
• Subtask 2: 0 / 10
• Subtask 3: 0 / 60