Compilare: main.cpp: In function 'int main()': main.cpp:85:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (di = 0 ; di < dir[j].size() ; di++ ) ~~~^~~~~~~~~~~~~~~ main.cpp:86:29: warning: array subscript has type 'char' [-Wchar-subscripts] d[dir[j][di]][(i+1)%2] = d[dir[j][di]][(i+1)%2] + d[j][i%2] ; ^ main.cpp:86:54: warning: array subscript has type 'char' [-Wchar-subscripts] d[dir[j][di]][(i+1)%2] = d[dir[j][di]][(i+1)%2] + d[j][i%2] ; ^ main.cpp:73:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n ) ; ^