# Is this an OJ issue?

• I got a "Wrong Answer" like this:

``````Input:		"A", 2
Output:		"A"
Expected:	"A"
``````

OJ issue? or my code issue? Thanks for help.

Here is my code:

``````class Solution {
public:
string convert(string s, int nRows) {
if (s.empty() || nRows <= 1) return s;

int sLen = s.size();
vector<vector<char>> aux;
for (int i = 0; i < nRows; i++) aux.push_back(vector<char>());

int rowMod = nRows - 1;
for (int i = 0; i < sLen; i++) {
if (i % (2 * rowMod) == 0) {
int j = i, idx = 0;
while (idx < nRows) aux[idx++].push_back(s[j++]);
i = j - 1;
} else {
int idx = i % rowMod;
aux[rowMod - idx].push_back(s[i]);
}
}

vector<char> rsltVec;
for (int i = 0; i < nRows; i++)
rsltVec.insert(rsltVec.end(), aux[i].begin(), aux[i].end());

string ret(rsltVec.begin(), rsltVec.end());
return ret;
}
};

int main(int argc, char **argv) {
if (argc != 3) {
cerr << "Usage:\n\t" << argv[0] << " <string> <rowNum>" << endl;
return 1;
}

string str(argv[1]);
int nRows = atoi(argv[2]);

Solution s;
cout << s.convert(str, nRows) << endl;

return 0;
}``````

• Please read the FAQ, especially the question: "Why is my output wrong answer even though it looks identical to expected?"

• I got it:

while (idx < nRows) aux[idx++].push_back(s[j++]);

should be:

while (j < sLen && idx < nRows) aux[idx++].push_back(s[j++]);

Thanks @1337c0d3r!

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