Compilare: main.cpp: In function 'int main()': main.cpp:24:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i < a.size(); i++ ) { ~~^~~~~~~~~~ main.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < b.size(); i++ ) { ~~^~~~~~~~~~ main.cpp:43:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( k == a.size() ) { ~~^~~~~~~~~~~ main.cpp:18:9: warning: unused variable 'p' [-Wunused-variable] int p; ^ main.cpp:15:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "strmatch.in", "r", stdin ); ^ main.cpp:16:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "strmatch.out", "w", stdout ); ^