Compilare: main.cpp: In function 'int main()': main.cpp:21:23: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][i+1]=cost[s[i]][s[i+1]]; ^ main.cpp:21:31: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][i+1]=cost[s[i]][s[i+1]]; ^ main.cpp:26:39: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][i+k]=dp[i+1][i+k-1]+cost[s[i]][s[i+k]]; ^ main.cpp:26:47: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][i+k]=dp[i+1][i+k-1]+cost[s[i]][s[i+k]]; ^