Compilare: user.cpp: In function ‘int main()’: user.cpp:61:26: warning: NULL used in arithmetic [-Wpointer-arith] for(j=j+1;si[j]!=NULL;j++) ^ user.cpp:53:23: warning: unused variable ‘st’ [-Wunused-variable] int n,m,i,j,l,x,y,st,dr; ^ user.cpp:53:26: warning: unused variable ‘dr’ [-Wunused-variable] int n,m,i,j,l,x,y,st,dr; ^ user.cpp:51:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.in","r",stdin); ^ user.cpp:52:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.out","w",stdout); ^ user.cpp:54:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:57:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(si+1); ^ /tmp/ccCWp3Qm.o: In function `main': user.cpp:(.text.startup+0x88): warning: the `gets' function is dangerous and should not be used.