Cod sursa(job #2847166)

Utilizator spqrBacain Octavian-Tiberiu spqr Data 10 februarie 2022 13:03:04
Problema Datorii Scor 100
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.74 kb
#include<fstream>

using namespace std;
ifstream fin("datorii.in");
ofstream fout("datorii.out");

int aib[15002], n, m;

void update(int poz,int val)
{
    while(poz <= n)
    {
        aib[poz] += val;
        poz += (poz&(-poz));
    }
}
int ras(int poz)
{
    int ans = 0;
    while(poz > 0)
    {
        ans += aib[poz];
        poz -= (poz&(-poz));
    }
    return ans;
}
int main()
{
    fin >> n >> m;
    for(int i = 1; i <= n; i++)
    {
        int x;
        fin >> x;
        update(i, x);
    }
    for(int i = 1; i <= m; i++)
    {
        int q, x, y;
        fin >> q >> x >> y;
        if(q==0)
            update(x, -y);
        else
            fout << ras(y) - ras(x - 1) << '\n';
    }
}