Compilare: main.cpp: In function 'void DFS(int, int)': main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void build(int, int, int)': main.cpp:49:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < tree[2 * node].A.size() && j < tree[2 * node + 1].A.size()) ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:49:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < tree[2 * node].A.size() && j < tree[2 * node + 1].A.size()) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:72:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < tree[2 * node].A.size()) ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:82:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < tree[2 * node + 1].A.size()) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~