Compilare: user.cpp: In function ‘int main()’: user.cpp:112:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<poz->ind.size();j++) ^ user.cpp:119:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<euro->ind.size();j++) ^ user.cpp:90:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in","r",stdin); ^ user.cpp:91:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.out","w",stdout); ^ user.cpp:92:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:93:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:96:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(temp); ^ /tmp/ccqfLZPZ.o: In function `main': user.cpp:(.text.startup+0x6d): warning: the `gets' function is dangerous and should not be used.