Compilare: main.cpp: In function 'void Read()': main.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < s.size(); ++i ) { ~~^~~~~~~~~~ main.cpp:19:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( strchr( "?!.", s[i] ) || ( i < s.size() - 2 && s[i] == '.' && s[i + 1] == '.' && s[i + 2] == '.' )) ~~^~~~~~~~~~~~~~ main.cpp:25:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( i < s.size() - 2 && s[i] == '.' && s[i + 1] == '.' && s[i + 2] == '.' ) i += 2; ~~^~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:34:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < sol.size(); ++i ) ~~^~~~~~~~~~~~