Compilare: main.cpp: In function 'int main()': main.cpp:31:17: warning: unused variable 'j' [-Wunused-variable] int n,m,k,i,j,st=1,dr=0; ^ main.cpp:32:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&n,&m,&k); ^ main.cpp:33:73: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&start.lin,&start.col,&finish.lin,&finish.col); ^ main.cpp:35:53: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&porti[i].lin,&porti[i].col); ^