Compilare: user.cpp: In function ‘void buildPattern()’: user.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<strlen(pattern); i++) ^ user.cpp: In function ‘void solve()’: user.cpp:41:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == strlen(pattern) - 1 && pattern[j] == text[i]) ^ user.cpp: In function ‘int main()’: user.cpp:55:39: 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); ^ user.cpp:56:41: 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); ^ user.cpp:58:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(pattern); ^ user.cpp:59:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(text); ^ /tmp/ccOwHAMX.o: In function `main': user.cpp:(.text.startup+0x70): warning: the `gets' function is dangerous and should not be used.