pat-bl-1027

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pat-bl-1027

2017-01-20

数学问题

/** * pat-bl-1027 * 2017-01-20 * C version */#include<stdio.h>int main(){  freopen("in.txt", "r", stdin);  int n;  char c;  scanf("%d %c", &n, &c);  int largestI;  int tmp = 0;  int remain;  int i, j;  for(i = 1;tmp <= n - 1;i++)//数学问题，找出规律后用公式进行计算和判断  {    tmp = (3 + (2 * i + 1)) * i;    //printf("i = %d, tmp = %d\n", i, tmp);  }  largestI = i - 2;  remain = n - 1 - (3 + (2 * largestI + 1)) * largestI;  //printf("largestI = %d, remain = %d\n", largestI, remain);  //output:  for(i = 0, j = (2 * largestI) + 1;j >= 1;i++, j -= 2)  {    for(int k = 0;k < i;k++)    {      putchar(' ');    }    for(int k = 0;k < j;k++)    {      putchar(c);    }    putchar('\n');  }  for(i -= 2, j = 3;j <= (2 * largestI) + 1;i--, j += 2)  {    for(int k = 0;k < i;k++)    {      putchar(' ');    }    for(int k = 0;k < j;k++)    {      putchar(c);    }    putchar('\n');  }  printf("%d\n", remain);}

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