Compilare: user.cpp: In function ‘int main()’: user.cpp:38:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] secv[i][i]|=p2[lis[x][j]]; ^ user.cpp:12:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minerale.in","r",stdin); ^ user.cpp:13:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("minerale.out","w",stdout); ^ user.cpp:15:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&r,&m); ^ user.cpp:21:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ user.cpp:29:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(qu+1); ^ /tmp/ccxqthDP.o: In function `main': user.cpp:(.text.startup+0xb6): warning: the `gets' function is dangerous and should not be used.