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    Codeforces Round #280 (Div. 2) A_html/css_WEB-ITnose

    2016-06-24 11:53:09原创452

    题目:

    A. Vanya and Cubes

    time limit per test

    1 second

    memory limit per test

    256 megabytes

    input

    standard input

    output

    standard output

    Vanya got n cubes. He decided to build a pyramid from them. Vanya wants to build the pyramid as follows: the top level of the pyramid must consist of 1 cube, the second level must consist of 1?+?2?=?3 cubes, the third level must have 1?+?2?+?3?=?6 cubes, and so on. Thus, the i-th level of the pyramid must have 1?+?2?+?...?+?(i?-?1)?+?i cubes.

    Vanya wants to know what is the maximum height of the pyramid that he can make using the given cubes.

    Input

    The first line contains integer n (1?≤?n?≤?104) ? the number of cubes given to Vanya.

    Output

    Print the maximum possible height of the pyramid in the single line.

    Sample test(s)

    input

    output

    input

    25

    output

    Note

    Illustration to the second sample:

    没啥好说的。模拟一下就可以了,还wa一发不应该..


    #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std;#define MIN(a, b) ((a) < (b) ? (a) : (b))#define MAX(a, b) ((a) > (b) ? (a) : (b))#define F(i, n) for(int (i)=0;(i)<(n);++(i))#define REP(i, s, t) for(int (i)=(s);(i)<=(t);++(i))#define UREP(i, s, t) for(int (i)=(s);(i)>=(t);--(i))#define REPOK(i, s, t, o) for(int (i)=(s);(i)<=(t) && (o);++(i))#define MEM0(addr) memset((addr), 0, sizeof((addr)))#define PI 3.1415926535897932384626433832795#define HALF_PI 1.5707963267948966192313216916398#define MAXN 100000#define MAXM 10000#define MOD 1000000007typedef long long LL;const double maxdouble = numeric_limits::max();const double eps = 1e-10;const int INF = 0x7FFFFFFF;int main(){    int n;    cin >> n;    int ans = 0;    int base = 1;    while (n >= base)    {        ++ans;        n -= base;        base += ans+1;    }    cout << ans;    return 0;}



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