Compilare: main.cpp: In function 'int main()': main.cpp:23:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dunarea.in","r",stdin); ^ main.cpp:24:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dunarea.out","w",stdout); ^ main.cpp:27:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&a,&b,&n); ^ main.cpp:30:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&v[i].x,&v[i].y); ^ main.cpp:45:17: warning: 'ult.interval::y' may be used uninitialized in this function [-Wmaybe-uninitialized] if(b>=ult.x && b<=ult.y){ ~~~~~~~~~^~~~~~~~~~~ main.cpp:45:5: warning: 'ult.interval::x' may be used uninitialized in this function [-Wmaybe-uninitialized] if(b>=ult.x && b<=ult.y){ ^~ main.cpp:57:20: warning: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] ult.x=v[poz-1].x; ~~~^~