Compilare: main.cpp: In function 'int main()': main.cpp:45:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:50:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a[i][j]); ^ main.cpp:105:11: warning: 'py' may be used uninitialized in this function [-Wmaybe-uninitialized] v[1].y=py; ~~~~~~^~~ main.cpp:104:11: warning: 'px' may be used uninitialized in this function [-Wmaybe-uninitialized] v[1].x=px; ~~~~~~^~~