Compilare: main.cpp: In function 'int main()': main.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s2.size(); ++i){ ~~^~~~~~~~~~~ main.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i - lg >= 0 && i + lg < s2.size() && s2[i - lg] == s2[i + lg]) ~~~~~~~^~~~~~~~~~~ main.cpp:12:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld.in", "r", stdin); ^ main.cpp:13:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pscpld.out", "w", stdout); ^