Compilare: user.cpp: In function ‘long long int solve(int)’: user.cpp:13:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i > strlen(s)) ~~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:114:13: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] in >> s + 1; ~~^~~ user.cpp:117:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i= 1; i <= strlen(s); i++) ~~^~~~~~~~~~~~