题解 | #A+B#

#include <stdio.h>
#include<string.h>
int main() {
    char temp;
    char a[100][20]={0};
    int len=0,j=0;
    while(scanf("%c",&temp)!=EOF){
        if(temp=='\n'||temp==' '){len++;j=0;}
        else{
            if(temp==','){}
            else{a[len][j]=temp;j++;}
        }
    }
    int n;
    if(len%2==1){ n=(len+1)/2;}
    else{n=len/2;}
    for(int i=0;i<n;i++){
        int len1=strlen(a[i*2]);
        int len2=strlen(a[i*2+1]);
        if(a[i*2][0]=='-'&&a[i*2+1][0]!='-'){
            int e=1;long value1=0,value2=0;
            for(int t=len1-1;t>0;t--){
                value1-=(int)(a[i*2][t]-'0')*e;
                e*=10;
            }
            e=1;
            for(int t=len2-1;t>=0;t--){
                 value2+=(int)(a[i*2+1][t]-'0')*e;
                e*=10;
            }
            value1=value1+value2;
            printf("%ld\n",value1);
        }
        else if(a[i*2][0]=='-'&&a[i*2+1][0]=='-'){
            int e=1;long value1=0,value2=0;
            for(int t=len1-1;t>0;t--){
                value1-=(int)(a[i*2][t]-'0')*e;
                e*=10;
            }
            e=1;
            for(int t=len2-1;t>0;t--){
                 value2-=(int)(a[i*2+1][t]-'0')*e;
                e*=10;
            }
            value1=value1+value2;
            printf("%ld\n",value1);
        }
        else if(a[i*2][0]!='-'&&a[i*2+1][0]!='-'){
            int e=1;long value1=0,value2=0;
            for(int t=len1-1;t>=0;t--){
                value1+=(int)(a[i*2][t]-'0')*e;
                e*=10;
            }
            e=1;
            for(int t=len2-1;t>=0;t--){
                 value2+=(int)(a[i*2+1][t]-'0')*e;
                e*=10;
            }
            value1=value1+value2;
            printf("%ld\n",value1);
        }
        else if(a[i*2][0]!='-'&&a[i*2+1][0]=='-'){
            int e=1;long value1=0,value2=0;
            for(int t=len1-1;t>=0;t--){
                value1+=(int)(a[i*2][t]-'0')*e;
                e*=10;
            }
            e=1;
            for(int t=len2-1;t>0;t--){
                 value2-=(int)(a[i*2+1][t]-'0')*e;
                e*=10;
            }
            value1=value1+value2;
            printf("%ld\n",value1);
        }
    }
    return 0;
}