Compilare: main.cpp: In function 'void getdist(int, int)': main.cpp:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < leaves.size() - 1; ++i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int leaf = 0; leaf < leaves.size(); ++leaf) if (leaves[leaf].x != u) { ~~~~~^~~~~~~~~~~~~~~ main.cpp:56:8: warning: unused variable 'dst' [-Wunused-variable] int dst = dist[u][lst]; ^~~ main.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[u].size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp: At global scope: main.cpp:49:12: warning: 'i64 max3(i64, i64, i64)' defined but not used [-Wunused-function] static i64 max3(i64 a, i64 b, i64 c) { ^~~~