PROG-T1009: Seven Segment

#include <bits/stdc++.h>
using namespace std;

typedef long long lli;

const int N = 10;
const int PB = 1e9 + 7;

vector<string> ex[10];
map<lli, char> mp;
char str[N][3][3];

lli inpNumber(int len){
    for(int i = 0; i < 3; ++i){
        for(int j = 0; j < len; ++j){
            for(int k = 0; k < 3; ++k){
                scanf("%c", &str[j][i][k]);
            }
            scanf("%*c");
        }
    }
    string a;
    for(int i = 0; i < len; ++i){
        lli hsh = 0;
        for(int j = 0; j < 3; ++j){
            for(int k = 0; k < 3; ++k){
                hsh *= PB;
                hsh += str[i][j][k];
            }
        }
        a += mp[hsh];
    }
    return stol(a);
}

int main(){

    ex[0] = {" _ ", "| |", "|_|"};
    ex[1] = {"   ", "  |", "  |"};
    ex[2] = {" _ ", " _|", "|_ "};
    ex[3] = {" _ ", " _|", " _|"};
    ex[4] = {"   ", "|_|", "  |"};
    ex[5] = {" _ ", "|_ ", " _|"};
    ex[6] = {" _ ", "|_ ", "|_|"};
    ex[7] = {" _ ", "  |", "  |"};
    ex[8] = {" _ ", "|_|", "|_|"};
    ex[9] = {" _ ", "|_|", " _|"};
    for(int i = 0; i < 10; ++i){
        lli hsh = 0;
        for(int j = 0; j < 3; ++j){
            for(int k = 0; k < 3; ++k){
                hsh *= PB;
                hsh += ex[i][j][k];
            }
        }
        mp[hsh] = '0' + i;
    }
    int lenA, lenB;
    scanf("%d%d%*c", &lenA, &lenB);
    lli a = inpNumber(lenA);
    lli b = inpNumber(lenB);
    cout << a + b;

    return 0;
}