PAT basic 1014.2

#include <iostream>#include <string>using namespace std;int main() {    string a, b, c, d;    cin >> a >> b >> c >> d;    int lena = a.length();    int lenb = b.length();    int min1 = lena < lenb ? lena : lenb;    int lenc = c.length();    int lend = d.length();    int min2 = lenc < lend ? lenc : lend;    char t[2];    int pos;    int j;    for (int i = 0; i < min1; i++) {        if (a[i] == b[i] && (a[i] >= 'A' && a[i] <= 'G')) {            t[0] = a[i];           // a[i] = '#';            j = i;            break;        }    }    for (int i = j + 1; i < min1; i++) {        if (a[i] == b[i] && ((a[i] >= 'A' && a[i] <= 'N') ||                             (a[i] >= '0' && a[i] <= '9'))) {            t[1] = a[i];                          break;        }    }    for (int i = 0; i < min2; i++) {        if (c[i] == d[i] && ((c[i] >= 'A' && c[i] <= 'Z') || (c[i] >= 'a' && c[i] <= 'z'))) {            pos = i;            break;        }    }    string week[7] = {"MON ", "TUE ", "WED ", "THU ", "FRI ", "SAT ", "SUN "};    int m;    if (t[1] >= '0' && t[1] <= '9') {        m = t[1] - '0';    } else {        m = t[1] - 'A' + 10;    }    cout << week[t[0]-'A'];    if (m >= 0 && m <= 9) {        cout << 0 << m << ":";    } else {        cout << m << ":";    }    if (pos >= 0 && pos <= 9) {        cout << 0 << pos;    } else {        cout << pos;    }    return 0;}