Submission #76765

#	Time	Username	Problem	Language	Result	Execution time	Memory
76765		Vardanyan	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	930 ms	22824 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
const int N = 200*1000+7;
long long a[N];
long long t[2][4*N];
long long T[4*N];
long long f[4*N];
inline void push(int v,int s,int e){
    if(f[v]){
        T[v] += ((e-s+1)*f[v]);
        if(s!=e){
            f[v*2] += f[v];
            f[v*2+1] += f[v];
        }
    }
    f[v] = 0;
}
inline void update(int v,int s,int e,int l,int r,long long val){
    if(l>r) return;
    push(v,s,e);
    if(s == l && e == r){
        f[v] += val;
        return;
    }
    int m = (s+e)/2;
    update(v*2,s,m,l,min(m,r),val);
    update(v*2+1,m+1,e,max(l,m+1),r,val);
    push(v*2,s,m);
    push(v*2+1,m+1,e);
    T[v] = T[v*2]+T[v*2+1];
}
inline long long query(int v,int s,int e,int l,int r){
    if(l>r) return 0;
    push(v,s,e);
    if(s == l && e == r) return T[v];
    int m = (s+e)/2;
    return query(v*2,s,m,l,min(m,r))+query(v*2+1,m+1,e,max(l,m+1),r);
}
int n;
inline long long sum(int nshan,int r){
    long long res = 0;
    for (; r > 0; r = (r & (r+1)) - 1)
		res += t[nshan][r];
	return res;
}
inline long long query2(int nshan,int l,int r){
    return sum(nshan,r)-sum(nshan,l-1);
}
inline long long update2(int nshan,int i,long long val){
   long long dw = query2(nshan,i,i);
   val-=dw;
    for (; i <= n; i = (i | (i+1)))
		t[nshan][i] += val;
}
int main(){
    int q;
    long long ss,tt;
    scanf("%d%d%lld%lld",&n,&q,&ss,&tt);
    for(int i = 0;i<=n;i++){
            scanf("%lld",&a[i]);
            update(1,0,n,i,i,a[i]);
    }
    for(int i = 1;i<=n;i++){
        long long df = a[i-1]-a[i];
        if(df>=0){
                update2(1,i,df);
        }
        else{
            update2(0,i,df);
        }
    }
    while(q--){
        int l,r;
        long long val;
        scanf("%d%d%lld",&l,&r,&val);
        update2(0,l,0);
        update2(1,l,0);
        update(1,0,n,l,r,val);
        long long x = query(1,0,n,l,l);
        long long y = query(1,0,n,l-1,l-1);
        y-=x;
        if(y<0) {
            update2(0,l,y);
        }
        else{
            update2(1,l,y);
        }
        if(r<n){
        update2(0,r+1,0);
        update2(1,r+1,0);
        x = query(1,0,n,r,r);
        y = query(1,0,n,r+1,r+1);
        x-=y;
        if(x<0){
            update2(0,r+1,x);
        }
        else{
            update2(1,r+1,x);
        }
        }
        long long w = query2(0,1,n);
        w*=ss;
        long long e = query2(1,1,n);
        e*=tt;
        w+=e;
        printf("%lld\n",w);
    }

    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'long long int update2(int, int, long long int)':
foehn_phenomena.cpp:54:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:58:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%lld%lld",&n,&q,&ss,&tt);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:60:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%lld",&a[i]);
             ~~~~~^~~~~~~~~~~~~~
foehn_phenomena.cpp:75:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%lld",&l,&r,&val);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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