Compilare: main.cpp: In function 'int main()': main.cpp:8:11: warning: unused variable 'first' [-Wunused-variable] #define x first ^ main.cpp:24:13: note: in expansion of macro 'x' int x,y; scanf("%d %d", &a[i].y, &a[i].x); ^ main.cpp:9:11: warning: unused variable 'second' [-Wunused-variable] #define y second ^ main.cpp:24:15: note: in expansion of macro 'y' int x,y; scanf("%d %d", &a[i].y, &a[i].x); ^ main.cpp:9:11: warning: unused variable 'second' [-Wunused-variable] #define y second ^ main.cpp:36:12: note: in expansion of macro 'y' ll y=it->y; ^ main.cpp:20:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("lupu.in", "r", stdin); ^ main.cpp:21:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("lupu.out", "w", stdout); ^ main.cpp:22:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &x, &l); ^ main.cpp:24:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int x,y; scanf("%d %d", &a[i].y, &a[i].x); ^