Compilare: user.cpp: In function ‘int main()’: user.cpp:34:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] a=(s[2][v1][j]+j*( s[1][v1][b-1]-s[1][v1][j] ) ) %mod; ^ user.cpp:34:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] a=(s[2][v1][j]+j*( s[1][v1][b-1]-s[1][v1][j] ) ) %mod; ^ user.cpp:34:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] a=(s[2][v1][j]+j*( s[1][v1][b-1]-s[1][v1][j] ) ) %mod; ^ user.cpp:39:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[1][v2][j]=s[1][v2][j-1]+a; ^ user.cpp:39:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[1][v2][j]=s[1][v2][j-1]+a; ^ user.cpp:41:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[2][v2][j]=(s[2][v2][j-1]+a*j)%mod; ^ user.cpp:41:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[2][v2][j]=(s[2][v2][j-1]+a*j)%mod; ^ user.cpp:7:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nr.in","r",stdin); ^ user.cpp:8:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nr.out","w",stdout); ^ user.cpp:9:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:10:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&b); ^