Compilare: user.cpp: In function ‘int main()’: user.cpp:36:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d", &n); ^ user.cpp:40:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d", &mat[i][j].val); ^ user.cpp:60:27: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] y = mat[x][y].urmy; ^ user.cpp:60:27: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized]