Compilare: main.cpp: In function 'void precalc()': main.cpp:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:28:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < b.size(); i++) ~~^~~~~~~~~~ main.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(idx == a.size())ans.push_back(i); ~~~~^~~~~~~~~~~ main.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < ans.size(); i++) ~~^~~~~~~~~~~~