Compilare: main.cpp: In function 'void build(int, int, int)': main.cpp:34:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p < v.size() && v[p].pos == l) ~~^~~~~~~~~~ main.cpp:52:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it < arb[pos * 2 + 1].size() && arb[pos * 2 + 1][it] <= i) ~~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:61:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(it < arb[pos * 2 + 1].size()) ~~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: At global scope: main.cpp:130:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:149:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < v.size(); i++) ~~^~~~~~~~~~