Submission #391944

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
391944	2021-04-20 08:32:34	Jarif_Rahman	Index (COCI21_index)	C++17	110 / 110	1650 ms	12288 KiB

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#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;
const int sq = 417, lim = 524288;
bool mo(tuple<int, int, int> a, tuple<int, int, int> b){
    return make_pair(get<0>(a)/sq, get<1>(a)) < make_pair(get<0>(b)/sq, get<1>(b));
}
struct segtree{
    int k;
    ll sm[lim];
    segtree(int n){
        k = lim;
    }
    void upd(int in, ll x){
        in+=k/2;
        sm[in] = x, in/=2;
        while(in > 0){
            sm[in] = sm[2*in] + sm[2*in+1];
            in/=2;
        }
    }
    inline ll sum(int l, int r, int nd, int a, int b){
        if(b < l || a > r) return 0;
        if(a >= l && b <= r) return sm[nd];
        int c = (a+b)/2;
        return sum(l, r, 2*nd, a, c) + sum(l, r, 2*nd+1, c+1, b);
 
 
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Compilation message (stderr)

index.cpp: In function 'int main()':
index.cpp:42:25: warning: 'pp.segtree::sm[<unknown>]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   42 |         return sm[k/2+in];
      |                         ^

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50