Compilare: main.cpp: In function 'bool check(int)': main.cpp:26:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = lg; i < strlen ( s[1] ); i++ ) ~~^~~~~~~~~~~~~~~~~ main.cpp:53:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if ( it != M.end() ) ^ main.cpp:76:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if ( it != M.end() ) ^ main.cpp: In function 'int main()': main.cpp:99:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( strlen ( s[i] ) < lgmin ) ~~~~~~~~~~~~~~~~^~~~~~~