Compilare: user.cpp: In function ‘int main()’: user.cpp:32:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); fscanf (f,"%d",&m); fscanf(f,"%d",&h); ^ user.cpp:32:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); fscanf (f,"%d",&m); fscanf(f,"%d",&h); ^ user.cpp:32:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); fscanf (f,"%d",&m); fscanf(f,"%d",&h); ^ user.cpp:35:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^ user.cpp: At global scope: user.cpp:9:18: warning: ‘c’ defined but not used [-Wunused-variable] struct {int x,y;}c[1000001]; ^