Compilare: main.cpp: In function 'int main()': main.cpp:49:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( start >= Cc.size() - 1 ) { ~~~~~~^~~~~~~~~~~~~~~~ main.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = start; i < Cc.size(); ++i ) { ~~^~~~~~~~~~~ main.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = i; j < Cc.size() - 1; ++j ) ~~^~~~~~~~~~~~~~~ main.cpp:69:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = i; j < Cc.size(); ) ~~^~~~~~~~~~~ main.cpp:85:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = start + solved; j < Cc.size() - 1; ++j ) ~~^~~~~~~~~~~~~~~