Compilare: user.cpp: In function ‘int main()’: user.cpp:25:21: warning: unused variable ‘l’ [-Wunused-variable] int n, m, i, j, l, k, ii, jj; ^ user.cpp:25:24: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, l, k, ii, jj; ^ user.cpp:25:27: warning: unused variable ‘ii’ [-Wunused-variable] int n, m, i, j, l, k, ii, jj; ^ user.cpp:25:31: warning: unused variable ‘jj’ [-Wunused-variable] int n, m, i, j, l, k, ii, jj; ^ user.cpp:23:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "simetric.in", "r", stdin ); ^ user.cpp:24:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "simetric.out", "w", stdout ); ^ user.cpp:26:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d", &n, &m ); ^ user.cpp:29:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &mat[i][j] ); ^