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- void prefsum(int k) {
- pref[0] = a[0];
- for (int i = 1; i < k; i++) {
- pref[i] = a[i] + pref[i - 1];
- }
- }
- int findb (int l, int r) {
- if (l < 0) return pref[r];
- else return pref[r] - pref[l - 1] ;
- }
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