1850: 判断第几天

解题思路:

注意事项:

参考代码:

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string str;
    int arr1[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    int arr2[12]={31,29,31,30,31,30,31,31,30,31,30,31};
    int arr3[10]={1000,100,10,1,0,10,1,0,10,1};
    int arr[9]={1000,100,10,1,0,10,1,10,1};
    
    int day=0;
    while(cin>>str){
        int year=0;
        int pos1=0,pos2=0;
        pos1=str.find("/");
        pos2=str.rfind("/");
        // cout<<pos1<<" "<<pos2<<endl;
        // cout<<str.size()<<endl;
        
        for(int i=0;i<pos1;i++){
            year+=(int)(str[i]-'0')*arr[i];
        }
        // cout<<"year="<<year<<endl;
        if((year%4==0&&year%100!=0) || year%400==0){
            int month=0;
            if(pos2-pos1==2){
                month+=(int)(str[5]-'0')*arr[6];
                //cout<<"month="<<month<<endl;
                if(month==2){
                    day=arr2[0];
                    int d=0;
                    if(str.size()-pos2==2){
                        day+=(int)(str[pos2+1]-'0')*arr[9];
                    }else{
                        for(int i=pos2+1;i<str.size();i++){
                            d+=(int)(str[i]-'0')*arr[i];
                        }
                        day+=d;
                    }
                    cout<<day<<endl;
                    day=0;
                }else if(month==1){
                    int d=0;
                    if(str.size()-pos2==2){
                        day+=(int)(str[pos2+1]-'0')*arr[8];
                    }else{
                        for(int i=pos2+1;i<str.size()-1;i++){
                            d+=(int)(str[i]-'0')*arr[i];
                        }
                        day+=d;
                    }
                    cout<<day<<endl;
                    day=0;
                }else{ // 3-9月
                    for(int i=0;i<month-1;i++){
                        day+=arr2[i];
                    }
                    int d=0;
                    if(str.size()-pos2==2){
                        day+=(int)(str[pos2+1]-'0')*arr3[9];
                    }else{
                        for(int i=pos2+1;i<str.size();i++){
                            d+=(int)(str[i]-'0')*arr[i];
                        }
                        day+=d;
                    }
                    cout<<day<<endl;
                    day=0;
                }
                
            }else{ // 10,11,12 月
                for(int i=pos1+1;i<pos2;i++){
                    month+=(int)(str[i]-'0')*arr[i];
                    // cout<<"month="<<month<<endl;
                }
                for(int i=0;i<month;i++){
                    day+=arr2[i];
                }
                int d=0;
                if(str.size()-pos2==2){
                    day+=(int)(str[pos2+1]-'0')*arr[8];
                }else{
                    for(int i=pos2+1;i<str.size();i++){
                        d+=(int)(str[i]-'0')*arr3[i];
                    }
                    day+=d;
                }
                cout<<day<<endl;
                day=0;
            }
            
            
            
        }else{ // 平年
            int month=0;
            if(pos2-pos1==2){
                month+=(int)(str[5]-'0')*arr[6];
                //cout<<"month="<<month<<endl;
                if(month==2){
                    day=arr1[0];
                    int d=0;
                    if(str.size()-pos2==2){
                        day+=(int)(str[pos2+1]-'0')*arr[9];
                    }else{
                        for(int i=pos2+1;i<str.size();i++){
                            d+=(int)(str[i]-'0')*arr[i];
                        }
                        day+=d;
                    }
                    cout<<day<<endl;
                    day=0;
                }else if(month==1){
                    int d=0;
                    if(str.size()-pos2==2){
                        day+=(int)(str[pos2+1]-'0')*arr[8];
                    }else{
                        for(int i=pos2+1;i<str.size()-1;i++){
                            d+=(int)(str[i]-'0')*arr[i];
                        }
                        day+=d;
                    }
                    cout<<day<<endl;
                    day=0;
                }else{ // 3-9月
                    for(int i=0;i<month-1;i++){
                        day+=arr1[i];
                    }
                    int d=0;
                    if(str.size()-pos2==2){
                        day+=(int)(str[pos2+1]-'0')*arr[9];
                    }else{
                        for(int i=pos2+1;i<str.size();i++){
                            d+=(int)(str[i]-'0')*arr[i];
                        }
                        day+=d;
                    }
                    cout<<day<<endl;
                    day=0;
                }
                
            }else{ // 10,11,12 月
                for(int i=pos1+1;i<pos2;i++){
                    month+=(int)(str[i]-'0')*arr3[i];
                    //cout<<"month="<<month<<endl;
                }
                for(int i=0;i<month;i++){
                    day+=arr1[i];
                }
                int d=0;
                if(str.size()-pos2==2){
                    day+=(int)(str[pos2+1]-'0')*arr3[9];
                }else{
                    for(int i=pos2+1;i<str.size();i++){
                        d+=(int)(str[i]-'0')*arr3[i];
                    }
                    day+=d;
                }
                cout<<day<<endl;
                day=0;
            }
        }
    }
    return 0;
}