Compilare: main.cpp: In function 'int main()': main.cpp:56:37: 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:57:39: 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:59:21: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a,N,stdin); ^ main.cpp:60:23: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(txt,N,stdin); ^ main.cpp: In function 'void kmp()': main.cpp:39:15: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] if(a[j] == txt[i]) ~~~^ main.cpp:40:21: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] ++i, ++j; ^