Compilare: user.cpp: In function ‘int main()’: user.cpp:31:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[a][b]=u[b][a]=1; ^ user.cpp:31:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[a][b]=u[b][a]=1; ^ user.cpp:31:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[a][b]=u[b][a]=1; ^ user.cpp:31:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[a][b]=u[b][a]=1; ^ user.cpp:39:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((!u[s[i]][s[p]])&&(d[i][j]+1>d[p][j])) ^ user.cpp:39:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((!u[s[i]][s[p]])&&(d[i][j]+1>d[p][j])) ^ user.cpp:42:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((!u[s[j]][s[p]])&&(d[i][j]+1>d[i][p])) ^ user.cpp:42:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((!u[s[j]][s[p]])&&(d[i][j]+1>d[i][p])) ^ user.cpp:15:35: warning: unused variable ‘q’ [-Wunused-variable] int n, i, m, j, p, ans, l, c, q, aux; ^ user.cpp:15:38: warning: unused variable ‘aux’ [-Wunused-variable] int n, i, m, j, p, ans, l, c, q, aux; ^ user.cpp:26:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &m); ^ user.cpp:53:17: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] while((l!=0)||(c!=0)){ ^ user.cpp:53:17: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized]