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void update(int pos, int val){
    int id = 1, ini = 1, fim = Q, mid, idx = 0;
    int ids[MAXN];
    while(ini != fim){
        mid = (ini + fim) / 2;
        ids[idx] = id;
        idx++;
        if(pos <= mid){
            id *= 2;
            fim = mid;
        }else{
            id = id * 2 + 1;
            ini = mid + 1;
        }
    }
    tree[id] = val;
    idx--;
    while(idx >= 0){
        id = ids[idx--];
        if(tree[id * 2] == 0)
            tree[id] = tree[id * 2 + 1];
        else if(tree[id * 2 + 1] == 0)
            tree[id] = tree[id * 2];
        else
            tree[id] = gcd(tree[id * 2], tree[id * 2 + 1]);
    }
}

prog.cpp: In function 'void update(int, int)':
prog.cpp:2:32: error: 'Q' was not declared in this scope
     int id = 1, ini = 1, fim = Q, mid, idx = 0;
                                ^
prog.cpp:3:13: error: 'MAXN' was not declared in this scope
     int ids[MAXN];
             ^
prog.cpp:5:9: error: 'mid' was not declared in this scope
         mid = (ini + fim) / 2;
         ^
prog.cpp:6:9: error: 'ids' was not declared in this scope
         ids[idx] = id;
         ^
prog.cpp:6:13: error: 'idx' was not declared in this scope
         ids[idx] = id;
             ^
prog.cpp:16:5: error: 'tree' was not declared in this scope
     tree[id] = val;
     ^
prog.cpp:17:5: error: 'idx' was not declared in this scope
     idx--;
     ^
prog.cpp:19:14: error: 'ids' was not declared in this scope
         id = ids[idx--];
              ^
prog.cpp:25:58: error: 'gcd' was not declared in this scope
             tree[id] = gcd(tree[id * 2], tree[id * 2 + 1]);
                                                          ^

Standard output is empty