Compilare: main.cpp: In function 'void Smen()': main.cpp:18:13: warning: unused variable 'val' [-Wunused-variable] int i,j,val; ^~~ main.cpp: In function 'int main()': main.cpp:57:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&p); ^ main.cpp:58:29: 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:61:49: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&xs,&ys,&xf,&yf); ^