Compilare: main.cpp: In function 'int main()': main.cpp:67:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ main.cpp:70:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^ main.cpp:84:19: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized] y=cnt[r][0]; ~~~~~~~~^