Compilare: user.cpp: In function ‘int main()’: user.cpp:16:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.length(); i++) if(s[i] == 'E') sol1++; ^ user.cpp:29:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= s.length(); i++) { ^ user.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == s.length()) sol2 = (sol2 / 2) % MOD; ^