Compilare: user.cpp: In function ‘int main()’: user.cpp:10:14: warning: unused variable ‘e’ [-Wunused-variable] int n,nr,e,i,x,y,max,t,pp; ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.in","r",stdin); ^ user.cpp:9:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi.out","w",stdout); ^ user.cpp:14:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:16:84: 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].a1,&v[i].b1,&v[i].a2,&v[i].b2,&v[i].a3,&v[i].b3); ^ user.cpp:17:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:41:62: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] s2=(float)abs(v[t].a1*v[i].b1+v[i].a1*v[t].b3+v[t].a3*v[t].b1-v[t].a3*v[i].b1-v[t].a1*v[t].b3-v[i].a1*v[t].b1)/2; ^