sprintf 将数字转化为字符数组十分的方变

C++ 代码

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <string>
#include <deque>
using namespace std;
int month[13][2]={{0,0},{31,31},{28,29},{31,31},{30,30},{31,31},{30,30},{31,31},{31,31},{30,30},{31,31},{30,30},{31,31}};
int n,yy,mm,dd,m;
int yy2,mm2,dd2;
int res;
int  isRun(int y){
    if(y%400==0 ||( y%4==0 && y%100!=0)) return 1;
    return 0;
}
bool myfun1(int y,int m,int d){
    char str[20];
    sprintf(str,"%d",y);
    sprintf(str+4,"%02d",m);
    sprintf(str+6,"%02d",d);

    for(int i=0,j=7;i<j;i++,j--){
        if(str[i]!=str[j]) return false;
    }
    return true;
}
int main(){
    cin>>n>>m;
    dd=n%100,n/=100;
    mm=n%100,n/=100;
    yy=n;

    dd2=m%100,m/=100;
    mm2=m%100,m/=100;
    yy2=m;

    while(yy<yy2 || mm<mm2 || dd<=dd2){
        if(dd>month[mm][isRun(yy)]){
            dd=1;
            mm++;
        }
        if(mm>=13){
            mm=1;
            yy++;
        }
        if(myfun1(yy,mm,dd)) res++;
        dd++;
    }
    cout<<res<<endl;
    return 0;
}