Compilare: user.cpp: In function ‘int main()’: user.cpp:13:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,xf,yf,nt=0,am=-1,lc,inc=70,sf=-1; ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.in","r",stdin); ^ user.cpp:12:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.out","w",stdout); ^ user.cpp:15:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:18:84: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&v[i].x1,&v[i].y1,&v[i].x2,&v[i].y2,&v[i].x3,&v[i].y3); ^ user.cpp:20:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&xf,&yf); ^ user.cpp:13:32: warning: ‘lc’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,j,xf,yf,nt=0,am=-1,lc,inc=70,sf=-1; ^