Submission #31120

#	Time	Username	Problem	Language	Result	Execution time	Memory
31120		trath	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	693 ms	23772 KiB

foehn_phenomena

#include <stdio.h>
#include <vector>
#include <algorithm>
using namespace std;
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define ll long long int
#define ieps 200010
#define eps (int) 1e9
#define pii pair<int,int>
struct node{
	ll leftmost, rightmost, sumup , sumdown;
	void clv(){
		leftmost = rightmost = sumup = sumdown = 0;
	}
};

int a , b , val;
int n , q ,   v[200100] ;
ll s , t;
ll lazy[560000];
node st[560000];
void propagate(int curr  , int l , int r){
	if(lazy[curr]){
		st[curr].leftmost += lazy[curr];
		st[curr].rightmost += lazy[curr];
		if(l != r){
		lazy[2*curr] += lazy[curr];
		lazy[2*curr + 1] += lazy[curr];
}	
		lazy[curr] = 0;
	}
	return;
}
node mixnode(node left, node right){
	node x;
	x.clv();
	ll toadd = 0 , tosubtract = 0;
	if(left.rightmost >= right.leftmost){
		toadd += t*(left.rightmost - right.leftmost);
	}
	else if(left.rightmost < right.leftmost){
		tosubtract += s*(right.leftmost - left.rightmost);
	}
	x.leftmost = left.leftmost;
	x.rightmost = right.rightmost;
	x.sumup = left.sumup + right.sumup + toadd;
	x.sumdown = left.sumdown + right.sumdown + tosubtract;
	return x;
}
void build(int l = 0 , int r = n- 1 , int curr = 1){
	if(l == r){
		st[curr].clv();
		st[curr].rightmost = st[curr].leftmost  = v[l];
		return;
	}
	build(l , (l+r)/2 , 2*curr);
	build((l+r)/2 + 1 , r, 2*curr + 1);
	st[curr] = mixnode(st[2*curr] , st[2*curr + 1]);
	return;
}
void update(int x , int y , int l = 0 , int r = n- 1 , int curr = 1){
	propagate(curr, l , r);
	if(l == x && r == y){
		lazy[curr]+=val;
		propagate(curr, l , r);
		return;
	}
	ll mid = (l+r)/2;
	if(y <= mid){
		update(x , y, l , mid , 2*curr);
	}
	else if(x > mid){
		update(x ,y, mid + 1 ,r , 2*curr + 1);

	}
	else{
		update(x , mid , l , mid , 2*curr);
		update(mid + 1 , y , mid + 1 , r , 2*curr + 1);
	}
	propagate(2*curr , l , mid);
	propagate(2*curr + 1 , mid + 1 , r);
	st[curr] = mixnode(st[2*curr] , st[2*curr + 1]);
	return;
}
int main(){
	scanf("%d %d %lld %lld", &n, &q, &s, &t);
	n = n+1;
	for(int i = 0;i<n;i++) scanf("%d", &(v[i]));;
	build();
	for(int i = 0;i<q;i++){
		scanf("%d%d%d", &a, &b, &val);
		update(a , b);
		ll p = st[1].sumup;
		p-=st[1].sumdown;
		printf("%lld\n",p);
	}
	return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:89:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %lld %lld", &n, &q, &s, &t);
                                          ^
foehn_phenomena.cpp:91:45: 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", &(v[i]));;
                                             ^
foehn_phenomena.cpp:94:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d", &a, &b, &val);
                                ^

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