Submission #340316

#	Time	Username	Problem	Language	Result	Execution time	Memory
340316		Kerim	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	415 ms	15084 KiB

foehn_phenomena

#include "bits/stdc++.h"
#define MAXN 200009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
ll s[MAXN<<2],ans;
int arr[MAXN],n,q,sa,t;
void inc(int l,int r,int v,int nd=1,int x=1,int y=n){
	if(l>y or x>r)return;
	if(l<=x and y<=r){s[nd]+=v;return;}
	int mid=(x+y)>>1;
	inc(l,r,v,nd<<1,x,mid);inc(l,r,v,nd<<1|1,mid+1,y);
}
ll get(int p,int nd=1,int x=1,int y=n){
	if(!p)return 0LL;
	if(x==y)return s[nd]+arr[x];
	int mid=(x+y)>>1;	
	if(p<=mid)return s[nd]+get(p,nd<<1,x,mid);
	return s[nd]+get(p,nd<<1|1,mid+1,y);
}
ll cost(int p){
	ll a=get(p),b=get(p+1);
	if(a<b)
		return sa*(a-b);
	return t*(a-b);
}
int main(){
    //freopen("dreaming.in", "r", stdin);
    scanf("%d%d%d%d",&n,&q,&sa,&t);
    for(int i=0;i<=n;i++)scanf("%d",arr+i);
	for(int i=0;i<n;i++)ans+=cost(i);
    while(q--){
    	int l,r,x;
		scanf("%d%d%d",&l,&r,&x);
		ans-=cost(l-1);if(r<n)ans-=cost(r);
		inc(l,r,x);	
		ans+=cost(l-1);if(r<n)ans+=cost(r);
		printf("%lld\n",ans);
    }
	return 0;
}

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]
   43 |     scanf("%d%d%d%d",&n,&q,&sa,&t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:44:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |     for(int i=0;i<=n;i++)scanf("%d",arr+i);
      |                          ~~~~~^~~~~~~~~~~~
foehn_phenomena.cpp:48:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   48 |   scanf("%d%d%d",&l,&r,&x);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~

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