暴力做法

#include <cstdio>
int main(){
    int n;
    scanf("%d",&n);
    printf("%d\n",n);
    printf("%d nota(s) de R$ 100,00\n",n/100);
    n%=100;
    printf("%d nota(s) de R$ 50,00\n",n/50);
    n%=50;
    printf("%d nota(s) de R$ 20,00\n",n/20);
    n%=20;
    printf("%d nota(s) de R$ 10,00\n",n/10);
    n%=10;
    printf("%d nota(s) de R$ 5,00\n",n/5);
    n%=5;
    printf("%d nota(s) de R$ 2,00\n",n/2);
    n%=2;
    printf("%d nota(s) de R$ 1,00\n",n/1);
    n%=1;
    return 0;
}

循环做法

#include <cstdio>
int money[7]={100,50,20,10,5,2,1};
int main(){
    int n;
    scanf("%d",&n);
    printf("%d\n",n);
    for(int i=0;i<7;i++){
        printf("%d nota(s) de R$ %d,00\n",n/money[i],money[i]);
        n%=money[i];
    }
    return 0;
}