Compilare: user.cpp: In function ‘void solve()’: user.cpp:83:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < table[lin].size(); ++i ) { ^ user.cpp:84:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( st < table[lin - 1].size() && table[lin - 1][st].y < table[lin][i].x ) ^ user.cpp:86:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( dr < table[lin - 1].size() && table[lin - 1][dr].x <= table[lin][i].y ) ^