Created
March 17, 2015 10:59
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#include <iostream> | |
#include <vector> | |
#include <set> | |
#include <algorithm> | |
#include <unordered_map> | |
#include <limits> | |
#include <map> | |
#include <iterator> | |
#include <cassert> | |
#include <cmath> | |
#include <cstdio> | |
#include <cstdlib> | |
int main() { | |
std::vector<std::string> vec_str; | |
int cases; | |
std::cin >> cases; | |
char buf[257]; | |
// ignore all \n | |
std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); | |
int min_len = std::numeric_limits<int>::max(); | |
for (int i = 0; i < cases; ++i) { | |
std::string tmp; | |
int len = tmp.length(); | |
min_len = std::min(len, min_len); | |
vec_str.push_back(std::move(tmp)); | |
} | |
std::string ans; | |
for (int i = 0; i < min_len; ++i) { | |
char ch = 0; | |
for (int j = 0; j < cases; ++j) { | |
int idx = vec_str[j].length() -1 - i; | |
char cur = vec_str[j][idx]; | |
if (ch == 0) { | |
ch = cur; | |
} else { | |
if (ch != cur) { | |
goto out; | |
} | |
} | |
} | |
ans += ch; | |
} | |
out: | |
std::reverse(std::begin(ans), std::end(ans)); | |
if (!ans.length()) { | |
std::cout << "nai" << std::endl; | |
} else { | |
std::cout << ans << std::endl; | |
} | |
return 0; | |
} |
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