Compilare: main.cpp: In function 'int main()': main.cpp:29:31: warning: variable 'll' set but not used [-Wunused-but-set-variable] int n, i, j, val, c, cc, l, ll ; ^~ main.cpp:30:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n ) ; ^ main.cpp:32:45: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &v[i].x, &v[i].y ) ; ^