20140719 「樹狀陣列 - 區間更新,區間求和」 POJ 3468 A Simple Problem with Integers
Language:
A Simple Problem with Integers
Description You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operation is to add some given number to each number in a given interval. The other is to ask for the sum of numbers in a given interval. Input The first line contains two numbers N and Q. 1 ≤ N,Q ≤ 100000. Output You need to answer all Q commands in order. One answer in a line. Sample Input 10 5 1 2 3 4 5 6 7 8 9 10 Q 4 4 Q 1 10 Q 2 4 C 3 6 3 Q 2 4 Sample Output 4 55 9 15 Hint The sums may exceed the range of 32-bit integers.Source |
All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please
#include <stdio.h>
#include <string.h>
#define MAXN 101000
#define lowbit(x) ((x)&(-x))
int n, m;
long long a[MAXN], b[MAXN], c[MAXN];
void add(long long s[], int i, int x){
for( ; i<=n; i+=lowbit(i)) s[i] += x;
}
long long sum(long long s[], int i){
long long ret = 0;
for( ; i>0; i-=lowbit(i) )
ret += s[i];
return ret;
}
long long sum_ans(int i){
return (i+1)*sum(b, i) - sum(c, i);
}
int main(){
long long L, R, x;
while( ~scanf("%d%d", &n, &m) ){
a[0] = 0;
for(int i=1; i<=n; i++){
scanf("%lld", &a[i]);
a[i] += a[i-1];
}
char s[10];
while( m-- ){
scanf("%s", s);
if( 'Q'==s[0] ){
scanf("%lld%lld", &L, &R);
long long ans = a[R]-a[L-1] +sum_ans(R)-sum_ans(L-1);
printf("%lld\n", ans );
}
else {
scanf("%lld%lld%lld", &L, &R, &x);
add(b, L, x); add(b, R+1, -x);
add(c, L, x*L); add(c, R+1, -x*(R+1));
}
}
}
return 0;
}
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20140719 「樹狀陣列 - 區間更新,區間求和」 POJ 3468 A Simple Problem with Integers
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