Compilare: main.cpp: In function 'int main()': main.cpp:38:17: warning: unused variable 'l' [-Wunused-variable] int i,st,dr,l,j,x1,y1,x2,y2,x3,y3,x4,y4,med,last; ^ main.cpp:36:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("patrate.in", "r",stdin); ^ main.cpp:37:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.out", "w",stdout); ^ main.cpp:39:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:41:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].y, &v[i].x); ^