题意：显示杨辉三角形。
解法：
组合数学公式：combi(n,m)=combi(n-1,m-1)+combi(n-1,m);
至于为什么有这个公式呢？那就是高中数学的内容啦
1: #include<stdlib.h>
2: #include<string.h>
3: #include<stdio.h>
4: #define N 31
5: int map[N][N];
6: void init(){7: int i,j;
8: memset(map,0,sizeof(map));
9: map[0][0]=1;
10: for(i=1;i<N;i++){ 11: for(j=1;j<=i;j++){12: map[i][j]=map[i-1][j-1]+map[i-1][j]; //关键代码
13: }
14: }
15: }
16: int main(){17: int n,i,j,cnt=0;
18: init();
19: while(scanf("%d",&n)!=EOF){20: cnt++;
21:
22: for(i=1;i<=n;i++){ 23: for(j=1;j<=i;j++){ 24: if(j!=1) printf(" "); 25: printf("%d",map[i][j]);26: }
27: printf("\n");28: }
29: printf("\n");30: }
31: }
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