Compilare: main.cpp: In function 'void euler(int, int)': main.cpp:86:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<matr[x][y].v.size();i++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:89:9: warning: this 'while' clause does not guard... [-Wmisleading-indentation] while(matr[matr[x][y].v[i].first][matr[x][y].v[i].second].v[j].first!=x || matr[matr[x][y].v[i].first][matr[x][y].v[i].second].v[j].second!=y) ^~~~~ main.cpp:92:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while' matr[matr[x][y].v[i].first][matr[x][y].v[i].second].v.erase(matr[matr[x][y].v[i].first][matr[x][y].v[i].second].v.begin()+j); ^~~~