标签:
15
//线段树 的区间更新,用好延迟标记
//#include<bits/stdc++.h>
#include<cstdio>
#include<algorithm>
using namespace std;
const int maxn=500011;
const int inf=999999999;
#define lson (rt<<1),L,M
#define rson (rt<<1|1),M+1,R
#define M ((L+R)>>1)
#define For(i,n) for(int i=0;i<(n);i++)
template<class T>inline T read(T&x)
{
char c;
while((c=getchar())<=32);
bool ok=false;
if(c=='-')ok=true,c=getchar();
for(x=0; c>32; c=getchar())
x=x*10+c-'0';
if(ok)x=-x;
return x;
}
template<class T> inline void read_(T&x,T&y)
{
read(x);
read(y);
}
template<class T> inline void write(T x)
{
if(x<0)putchar('-'),x=-x;
if(x<10)putchar(x+'0');
else write(x/10),putchar(x%10+'0');
}
template<class T>inline void writeln(T x)
{
write(x);
putchar('\n');
}
//-------IO template------
typedef __int64 LL;
struct node
{
LL sum;
LL inv;
node(){sum=0;inv=0;}
}p[maxn<<2];
void build(LL rt,LL L,LL R)
{
if(L==R)
{
scanf("%I64d",&p[rt].sum);//read(p[rt].sum);
return;
}
build(lson);
build(rson);
p[rt].sum=p[rt<<1].sum+p[rt<<1|1].sum;
}
void update(LL rt,LL L,LL R,LL x,LL y,LL add)
{
if(L==x&&R==y)
{
p[rt].inv+=add;
p[rt].sum+=(LL)add*(R-L+1);
return;
}
if(p[rt].inv)///p[rt].inv可能收负数,之前写成了p[rt].inv>0 导致WA很多次
{
p[rt<<1].inv+=p[rt].inv;
p[rt<<1|1].inv+=p[rt].inv;
p[rt<<1].sum+=(LL)p[rt].inv*(M-L+1);
p[rt<<1|1].sum+=(LL)p[rt].inv*(R-M);
p[rt].inv=0;
}
if(y<=M)
update(lson,x,y,add);
else if(x>M)
update(rson,x,y,add);
else{
update(lson,x,M,add);
update(rson,M+1,y,add);
}
p[rt].sum=p[rt<<1].sum+p[rt<<1|1].sum;
}
LL query(LL rt,LL L,LL R,LL x,LL y)
{
if(x==L&&y==R)
{
return p[rt].sum;//+p[rt].inv*(R-L+1);
}
if(p[rt].inv)
{
p[rt<<1].inv+=p[rt].inv;
p[rt<<1|1].inv+=p[rt].inv;
p[rt<<1].sum+=(LL)p[rt].inv*(M-L+1);
p[rt<<1|1].sum+=(LL)p[rt].inv*(R-M);
p[rt].inv=0;
}
if(y<=M)
return query(lson,x,y);
else if(x>M)
return query(rson,x,y);
else return query(lson,x,M)+query(rson,M+1,y);
}
int main()
{
//#ifndef ONLINE_JUDGE
// freopen("in.txt","r",stdin);
// #endif // ONLINE_JUDGE
LL m,n,i,j,k,t;
while(~scanf("%I64d%I64d",&n,&m))
{
build(1,1,n);
char op[2];
while(m--)
{
LL x,y;
scanf("%s",op);scanf("%I64d%I64d",&x,&y);
if(op[0]=='Q')
{
printf("%I64d\n",query(1,1,n,x,y));
}
else{
LL z;
scanf("%I64d",&z);
update(1,1,n,x,y,z);
}
}
}
return 0;
}
C - A Simple Problem with Integers POJ 3468
标签:
原文地址:http://blog.csdn.net/u013167299/article/details/44861097