Compilare: main.cpp: In function 'int main()': main.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < c.size(); i++) ~~^~~~~~~~~~ main.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = c.size(); i < d.size(); i++) ~~^~~~~~~~~~ main.cpp:11:39: 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:22:5: note: in expansion of macro 'FILES' FILES ^~~~~ main.cpp:12:41: 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); ^ main.cpp:22:5: note: in expansion of macro 'FILES' FILES ^~~~~