Compilare: main.cpp: In function 'void build_rmq()': main.cpp:45:20: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] if (i + (1 << lg - 1) < e) ~~~^~~ main.cpp:46:62: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] rmq[lg][i] = max(rmq[lg - 1][i], rmq[lg - 1][i + (1 << lg - 1)]); } } ~~~^~~ main.cpp: At global scope: main.cpp:54:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() { ^ main.cpp: In function 'int main()': main.cpp:80:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aps[nod].size(); ++i) { ~~^~~~~~~~~~~~~~~~~ main.cpp:81:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int a = aps[nod][i], b = aps[nod][i + 1 == aps[nod].size() ? 0 : i + 1]; ~~~~~~^~~~~~~~~~~~~~~~~~