Compilare: main.cpp: In function 'int main()': main.cpp:37:13: warning: unused variable 'x' [-Wunused-variable] int x, y, c; ^ main.cpp:37:16: warning: unused variable 'y' [-Wunused-variable] int x, y, c; ^ main.cpp:37:19: warning: unused variable 'c' [-Wunused-variable] int x, y, c; ^ main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ans.size(); i++) ~^~~~~~~~~~~