Compilare: main.cpp: In function 'int main()': main.cpp:24:16: warning: array subscript has type 'char' [-Wchar-subscripts] f[c]++; ^ main.cpp:43:73: warning: array subscript has type 'char' [-Wchar-subscripts] if (d[i][j] - d[i][j-m] - d[i-m][j] + d[i-m][j-m] != f[t]){ ^