Compilare: user.cpp: In function ‘int main()’: user.cpp:29:24: warning: unused variable ‘x’ [-Wunused-variable] int t, n, i, j, k, x, y, l, lmax; ^ user.cpp:29:27: warning: unused variable ‘y’ [-Wunused-variable] int t, n, i, j, k, x, y, l, lmax; ^ user.cpp:33:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &t); ^ user.cpp:35:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ user.cpp:37:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &v[j][0], &v[j][1]); ^