Compilare: main.cpp: In function 'int main()': main.cpp:46:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<eu.size(); ++i) { ~^~~~~~~~~~ main.cpp:48:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] mp[make_pair(eu[i], eu[i + 1 == eu.size() ? 0 : i + 1])] = i; ~~~~~~^~~~~~~~~~~~ main.cpp:51:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<=eu.size(); ++i) ~^~~~~~~~~~~ main.cpp:60:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int p=1; (1<<p)<=eu.size(); ++p) ~~~~~~^~~~~~~~~~~ main.cpp:61:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i+(1<<p)-1<=eu.size(); ++i) ~~~~~~~~~~^~~~~~~~~~~ main.cpp:65:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<wh[i].size(); ++j) { ~^~~~~~~~~~~~~ main.cpp:66:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int a=wh[i][j], b=wh[i][j+1==wh[i].size()?0:j+1]; ~~~^~~~~~~~~~~~~~