Compilare: user.cpp: In function ‘int main()’: user.cpp:9:19: warning: unused variable ‘lin’ [-Wunused-variable] int n, m, i, j, lin, col, nr; ^ user.cpp:9:24: warning: unused variable ‘col’ [-Wunused-variable] int n, m, i, j, lin, col, nr; ^ user.cpp:9:29: warning: unused variable ‘nr’ [-Wunused-variable] int n, m, i, j, lin, col, nr; ^ user.cpp:10:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:13:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i][j]); ^