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package offer;

public class offer_64 {

static class Solution {

public int sumNums(int n) {

boolean flag = n > 0 && (n += sumNums(n - 1)) > 0;

return n;

}

}

public static void main(String[] args) {

Solution solution = new Solution();

int i = solution.sumNums(10);

System.out.println(i);

}

static class Solution1 {

public int sumNums(int n) {

int ans = 0, A = n, B = n + 1;

boolean flag;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

flag = ((B & 1) > 0) && (ans += A) > 0;

A <<= 1;

B >>= 1;

return ans >> 1;

}

}

}