Compilare: main.cpp: In function 'int main()': main.cpp:46:18: warning: operation on 's' may be undefined [-Wsequence-point] 46 | s=s=st[k-2].x*(st[k-1].y-v[i].y)+st[k-1].x*(v[i].y-st[k-2].y)+v[i].x*(st[i-2].y-st[i-1].y); | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:67:18: warning: operation on 's' may be undefined [-Wsequence-point] 67 | s=s=st[k-2].x*(st[k-1].y-v[i].y)+st[k-1].x*(v[i].y-st[k-2].y)+v[i].x*(st[i-2].y-st[i-1].y); | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:34:17: warning: unused variable 'S' [-Wunused-variable] 34 | long double S=0; | ^ main.cpp: In function 'bool cmp(punct, punct)': main.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type] 23 | } | ^