Compilare: user.cpp: In function ‘int main()’: user.cpp:62:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<strlen(s);++j) ^ user.cpp:49:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen ("padure.in","r",stdin); ^ user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("padure.out","w",stdout); ^ user.cpp:53:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&n,&m,&x,&y,&z,&t); ^ user.cpp:56:8: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(k); ^ user.cpp:61:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccTr2izF.o: In function `main': user.cpp:(.text.startup+0xc8): warning: the `gets' function is dangerous and should not be used.