Compilare: main.cpp: In function 'void read()': main.cpp:16:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&n,&m); ^ main.cpp:18:55: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&c[i]),been[i]=start[i]=lm[i]=0; ^ main.cpp:20:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&x,&y); ^ main.cpp: In function 'void solve()': main.cpp:39:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&t); ^