Compilare: main.cpp: In function 'int main()': main.cpp:9:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grea.in","r",stdin); ^ main.cpp:10:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grea.out","w",stdout); ^ main.cpp:12:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ main.cpp:18:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&a[i][j]); ^ main.cpp:28:12: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] while(y<n) ~^~ main.cpp:48:13: warning: 'lsta' may be used uninitialized in this function [-Wmaybe-uninitialized] if(lsta==2) ^~