Compilare: main.cpp: In function 'int main()': main.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); i++) { ~~^~~~~~~~~~ main.cpp:18:12: warning: array subscript has type 'char' [-Wchar-subscripts] dp[s[i]][1] = max(dp[s[i]][1], 1); ^ main.cpp:18:30: warning: array subscript has type 'char' [-Wchar-subscripts] dp[s[i]][1] = max(dp[s[i]][1], 1); ^ main.cpp:20:14: warning: array subscript has type 'char' [-Wchar-subscripts] dp[s[i]][0] = max(dp[s[i]][0], dp[j][1] + 1); ^ main.cpp:20:32: warning: array subscript has type 'char' [-Wchar-subscripts] dp[s[i]][0] = max(dp[s[i]][0], dp[j][1] + 1); ^ main.cpp:22:14: warning: array subscript has type 'char' [-Wchar-subscripts] dp[s[i]][1] = max(dp[s[i]][1], dp[j][0] + 1); ^ main.cpp:22:32: warning: array subscript has type 'char' [-Wchar-subscripts] dp[s[i]][1] = max(dp[s[i]][1], dp[j][0] + 1); ^