Compilare: main.cpp: In function 'int main()': main.cpp:39:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 1; j < b.size(); j++ ) ~~^~~~~~~~~~ main.cpp:46:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:55:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:57:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 1; j < b.size(); j++ ) ~~^~~~~~~~~~ main.cpp:97:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < res.size(); i++ ) ~~^~~~~~~~~~~~ main.cpp:7:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.in","r",stdin); ^ main.cpp:8:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.out","w",stdout); ^