用ceil和floor的时候,记得保证参数是double

#include 
    
     #include 
     
      #include 
      
       using namespace std;vector
       
         numsStartWith;char str[10];int main() {    int K;    int N;    int i;    numsStartWith.resize(10);    for (i = 0; i < numsStartWith.size(); ++i) numsStartWith[i] = 0;    scanf("%d %d", &K, &N);    for (i = 0; i < N; ++i) {        scanf("%s", str);        ++numsStartWith[str[0] - '0'];    }    int ans = 0;    for (i = 1; i <= 9; ++i) {        if (numsStartWith[i] == 0) continue;        ans = ans + (int)ceil((double)numsStartWith[i] / K);    }    printf("%d\n", ans + 2);    return 0;}