## #2235984

Solution for DSL_2_B: Range Sum Query (RSQ) by Tsuta_J

Source Code Status Test Cases
Policy: public     Reviewed: 42
00.11 sec    4072 KB    49 lines     1145 bytes    2017-03-29 16:15
```#include <bits/stdc++.h>
using namespace std;

struct SegmentTree {
private:
int n;
vector<int> node;
public:
SegmentTree(vector<int> v) {
int sz = (int)v.size();
n = 1; while(n < sz) n *= 2;
node.resize(2*n-1, 0);

for(int i=0; i<sz; i++) node[i+n-1] = v[i];
for(int i=n-2; i>=0; i--) node[i] = node[i*2+1] + node[i*2+2];
}

void add(int k, int val) {
k += (n - 1);
node[k] += val;

while(k > 0) {
k = (k - 1) / 2;
node[k] = node[2*k+1] + node[2*k+2];
}
}

int getsum(int a, int b, int k=0, int l=0, int r=-1) {
if(r < 0) r = n;
if(b <= l || r <= a) return 0;
if(a <= l && r <= b) return node[k];

int vl = getsum(a, b, 2*k+1, l, (l+r)/2);
int vr = getsum(a, b, 2*k+2, (l+r)/2, r);
return vl + vr;
}
};

int main() {
int n, q; cin >> n >> q;
SegmentTree seg( vector<int>(n, 0) );
for(int i=0; i<q; i++) {
int c, x, y; cin >> c >> x >> y;
if(c == 0) seg.add(x-1, y);
else cout << seg.getsum(x-1, y) << endl;
}
return 0;
}

```
 Compile Error Logs: You are not authorized to see the message.

Status
 Judge: 20/20 C++ CPU: 00.11 sec Memory: 4072 KB Length: 1145 B 2017-03-29 16:15 2017-03-29 16:15
Results for testcases
 Case # Verdict CPU Time Memory In Out Case Name Case #1: : Accepted 00.00 sec 3092 KB Case #2: : Accepted 00.00 sec 3088 KB Case #3: : Accepted 00.00 sec 3000 KB Case #4: : Accepted 00.00 sec 3072 KB Case #5: : Accepted 00.00 sec 3096 KB Case #6: : Accepted 00.00 sec 3072 KB Case #7: : Accepted 00.00 sec 3088 KB Case #8: : Accepted 00.00 sec 3012 KB Case #9: : Accepted 00.00 sec 3096 KB Case #10: : Accepted 00.00 sec 3056 KB Case #11: : Accepted 00.00 sec 3020 KB Case #12: : Accepted 00.01 sec 3128 KB Case #13: : Accepted 00.00 sec 3028 KB Case #14: : Accepted 00.07 sec 3544 KB Case #15: : Accepted 00.07 sec 3628 KB Case #16: : Accepted 00.08 sec 3584 KB Case #17: : Accepted 00.10 sec 4032 KB Case #18: : Accepted 00.11 sec 4052 KB Case #19: : Accepted 00.10 sec 4008 KB Case #20: : Accepted 00.10 sec 4072 KB
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