Compilare: main.cpp: In function 'void calcDp(int, int)': main.cpp:64:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sons.size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp: In function 'void moveRoot(int, int, int)': main.cpp:123:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sons.size(); ++i) { ~~^~~~~~~~~~~~~ main.cpp:128:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < sons.size(); ++j) { ~~^~~~~~~~~~~~~