Compilare: main.cpp: In function 'int main()': main.cpp:94:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<ev[i].size();j++) ~^~~~~~~~~~~~~ main.cpp:101:18: warning: unused variable 'j' [-Wunused-variable] for(auto j:ev[i]) ^ main.cpp:111:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable] bool ok=0; ^~ main.cpp:163:18: warning: variable 'ok' set but not used [-Wunused-but-set-variable] bool ok=0; ^~ main.cpp:208:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable] bool ok=0; ^~ main.cpp:88:9: warning: unused variable 'root' [-Wunused-variable] int root=getcentroid(1,1); ^~~~