Compilare: main.cpp: In function 'int main()': main.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<sx[i].size();++k) if(y[sx[i][k]]==y[sx[i][k-1]]+1) ~^~~~~~~~~~~~~ main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<sy[i].size();++k) if(x[sy[i][k]]==x[sy[i][k-1]]+1) ~^~~~~~~~~~~~~