492A - Vanya and Cubes

#include <cmath>#include <cstdio>#include <cstdlib>#include <cstring>#include <iostream>#include <string>#include <vector>#include <queue>#include <algorithm>using namespace std;int arr[201], sum[201];int main() {    arr[0] = 0;    for(int i = 1; i < 201; ++i) {        arr[i] = arr[i-1]+i;    }    sum[0] = 0;    for(int i = 1; i < 201; ++i) {        sum[i] = sum[i-1] + arr[i];    }    int n;    int id = 0;    cin >> n;    while(n >= sum[id]) id++;    cout << id - 1 << endl;    return 0;}