Compilare: user.cpp: In function ‘int main()’: user.cpp:23:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.in","r",stdin); ^ user.cpp:24:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ferma3.out","w",stdout); ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d\n",&v,&n,&m); ^ user.cpp:27:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",a[i]); ^ user.cpp:65:10: warning: ‘lit’ may be used uninitialized in this function [-Wmaybe-uninitialized] fputc(lit,stdout); ~~~~~^~~~~~~~~~~~ user.cpp:64:11: warning: ‘col’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n",lin+1,col+1); ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp:64:11: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized]