Compilare: main.cpp: In function 'int main()': main.cpp:40:33: 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:41:35: 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:42:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ main.cpp:46:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf(" %c",&a[i][j]); ^ main.cpp:60:14: warning: array subscript is above array bounds [-Warray-bounds] ans[2][1]=0; ~~~~~^ main.cpp:64:22: warning: array subscript is above array bounds [-Warray-bounds] printf("%d",ans[2][n]); ~~~~~^