Compilare: user.cpp: In function ‘int main()’: user.cpp:11:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, i, x, y, z; ^ user.cpp:11:24: warning: unused variable ‘z’ [-Wunused-variable] int n, m, i, x, y, z; ^ user.cpp:9:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "royfloyd.in", "r", stdin ); ^ user.cpp:10:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "royfloyd.out", "w",stdout ); ^ user.cpp:12:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n); ^ user.cpp:15:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &mat[x][y] ); ^ user.cpp:15:37: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] scanf( "%d", &mat[x][y] ); ^