枚举数组所有组合

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#include <stdio.h> #include <stdbool.h>   void PrintAll(int a[], int nBegin, int nEnd, int nCount, char* szPre){     if(nCount==1){         for(int i=nBegin; i<=nEnd; i++){             printf("%s%d ", szPre, a[i] );         }         printf("\n");     }else{         for(int i=nBegin; i<=nEnd-nCount+1; i++){             char szBuf[10]= {0};             sprintf(szBuf, "%s%d", szPre,a[i] );             PrintAll(a, i+1, nEnd, nCount-1, szBuf);         }     } }   int main(){     int a[] = {1,2,3,4,5,6};     PrintAll(a, 0, 5, 3, "");     return 1; }