Compilare: user.cpp: In function ‘int main()’: user.cpp:7:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define For(i, x, y) for(int i = x; i <= y; ++i) user.cpp:41:9: For(i, 1, v.size() - 1){ ~~~~~~~~~~~~~~~~~~ user.cpp:41:5: note: in expansion of macro ‘For’ For(i, 1, v.size() - 1){ ^~~ user.cpp:7:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define For(i, x, y) for(int i = x; i <= y; ++i) user.cpp:47:10: For(i, 0, v.size() - 1){ ~~~~~~~~~~~~~~~~~~ user.cpp:47:6: note: in expansion of macro ‘For’ For(i, 0, v.size() - 1){ ^~~ user.cpp:51:33: warning: ‘el2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mx1 = 0, mx2 = 0, el1, el2; ^~~ user.cpp:51:28: warning: ‘el1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int mx1 = 0, mx2 = 0, el1, el2; ^~~