Compilare: user.cpp: In function ‘int main()’: user.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i ++) ^ user.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < n; i ++) ^ user.cpp:112:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i ++) ^ user.cpp:116:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i ++) ^ user.cpp:118:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m; i ++) ^