Compilare: main.cpp: In function 'int main()': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[i].size() > maxL) { ~~~~~~~~~~~~^~~~~~ main.cpp:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } else if (a[i].size() == maxL) { ~~~~~~~~~~~~^~~~~~~ main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == a[i].size()) ~~^~~~~~~~~~~~~~ main.cpp:45:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == a[i].size()) ~~^~~~~~~~~~~~~~ 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("interesant.in", "r", stdin); ^ main.cpp:14:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("interesant.out", "w", stdout); ^