Compilare: main.cpp: In function 'void MarkNodesPlus(int, int)': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<p[x].toNodes.size();++i) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void MarkNodesMinus(int, int)': main.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<p[x].fromNodes.size();++i) ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void add(std::vector<int>&, int, int)': main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<p[x].toNodes.size();++i) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:75:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Sol.size();++i) ~^~~~~~~~~~~ main.cpp:77:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Sol[i].size();++j) ~^~~~~~~~~~~~~~