Compilare: main.cpp: In function 'void solve(int, int)': main.cpp:39:18: warning: array subscript has type 'char' [-Wchar-subscripts] sum[i][ch] = 1; ^ main.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int cnt = 1; cnt <= s2.size(); ++cnt) ~~~~^~~~~~~~~~~~ main.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= aux.size(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s2.size(); ++i) ~~^~~~~~~~~~~ main.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s1.size(); ++i) ~~^~~~~~~~~~~ main.cpp:81:17: warning: array subscript has type 'char' [-Wchar-subscripts] ++fr2[ch]; ^ main.cpp:82:19: warning: array subscript has type 'char' [-Wchar-subscripts] if (fr2[ch] == fr[ch]) ^ main.cpp:82:29: warning: array subscript has type 'char' [-Wchar-subscripts] if (fr2[ch] == fr[ch]) ^ main.cpp:99:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < idk.size(); ++i) ~~^~~~~~~~~~~~