Compilare: user.cpp: In function ‘int main()’: user.cpp:58:13: warning: unused variable ‘t1’ [-Wunused-variable] int n, m, t1, t2, t3, t4; ^ user.cpp:58:17: warning: unused variable ‘t2’ [-Wunused-variable] int n, m, t1, t2, t3, t4; ^ user.cpp:58:21: warning: unused variable ‘t3’ [-Wunused-variable] int n, m, t1, t2, t3, t4; ^ user.cpp:58:25: warning: unused variable ‘t4’ [-Wunused-variable] int n, m, t1, t2, t3, t4; ^ user.cpp:60:30: 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:63:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &v[i][j].z, &v[i][j].b); ^