PAT 1035. Password

#include <cstdio>

#include <cstdlib>

#include <vector>



using namespace std;



class Item {

public:

    char uid[12];

    char pwd[12];

};



char tbl[256];



void init_tbl() {

    for (int i=0; i<256; i++) {

        tbl[i] = i;

    }

    tbl['1'] = '@';

    tbl['0'] = '%';

    tbl['l'] = 'L';

    tbl['O'] = 'o';

}



int main() {

    int N;

    scanf("%d", &N);

    vector<Item> ids(N);

    vector<int> changed;

    

    init_tbl();

    

    int len = ids.size();

    for (int i=0; i<len; i++) {

        scanf("%s%s", ids[i].uid, ids[i].pwd);

        bool updated = false;

        int k = 0;

        char ch = '\0';

        while ((ch = ids[i].pwd[k]) != '\0') {

            if (ch != tbl[ch]) {

                ids[i].pwd[k] = tbl[ch];

                updated = true;

            }

            k++;

        }

        if (updated) {

            changed.push_back(i);

        }

    }

    

    int clen = changed.size();

    

    if (clen == 0) {

        if (N != 1) {

            printf("There are %d accounts and no account is modified\n", N);

        } else {

            printf("There is 1 account and no account is modified\n");

        }

    } else {

        printf("%d\n", clen);

        for (int i=0; i<clen; i++) {

            printf("%s %s\n", ids[changed[i]].uid, ids[changed[i]].pwd);

        }

    }

    

    return 0;

}

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