Compilare: main.cpp: In function 'void solve2()': main.cpp:86:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); i++) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:100:15: warning: iteration 58 invokes undefined behavior [-Waggressive-loop-optimizations] sz[i] = sz[i - 1] * 2; ~~~~~~^~~~~~~~~~~~~~~ main.cpp:99:22: note: within this loop for(int i = 2; i <= 60; i++) ~~^~~~~