Compilare: main.cpp: In function 'int main()': main.cpp:27:10: warning: variable 'left' set but not used [-Wunused-but-set-variable] double left, down; ^~~~ main.cpp:30:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:32:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x2[i], &y2[i]); ^