钱币兑换
看有多少个2和3,其余的都是1
1 #include <stdio.h> 2 3 int main() { 4 int count = 0; 5 int N; 6 while(scanf("%d",&N)!=EOF){ 7 int count = 0; 8 { 9 for (int j = 0; j <= N/2 ; j++) 10 { 11 for (int k = 0; k <= (N-2*j)/3; k++) 12 { 13 if(2*j+3*k<=N){ 14 count++; 15 } 16 } 17 } 18 } 19 printf("%d\n",count); 20 } 21 }