Compilare: user.cpp: In function ‘int main()’: user.cpp:71:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<=v[bits[i].second].length()-1;j++) ^ user.cpp:78:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<=v[bits[i].second].length()-1;j++); ^ user.cpp:37:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("litere2.in","r",stdin); ^ user.cpp:39:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(c); ^ /tmp/cc2VOcUv.o: In function `main': user.cpp:(.text.startup+0x77): warning: the `gets' function is dangerous and should not be used.