#include #define n 5 //你想打印几行就把5改成几就可以了int main(){ int i = 0, j = 0; for(i=0; i < n; i++){ for(j=1; j<=2*n-1; j++){ if(jn+i) printf(" "); else printf("%d",i+1); } printf("\n"); } return 0; }