Compilare: main.cpp:4:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas] #pragma GCC optimization ("O3") main.cpp:5:0: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas] #pragma GCC optimization ("unroll-loops") main.cpp: In function 'int32_t main()': main.cpp:80:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = s.size(); i < kmp.size(); i++) ~~^~~~~~~~~~~~ main.cpp:82:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pi[i] == s.size()) main.cpp:65:36: 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:66:38: 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); ^