Compilare: user.cpp: In function ‘void read()’: user.cpp:48:9: warning: unused variable ‘rx’ [-Wunused-variable] int rx, ry; ^ user.cpp:48:13: warning: unused variable ‘ry’ [-Wunused-variable] int rx, ry; ^ user.cpp: In function ‘void solve()’: user.cpp:63:9: warning: unused variable ‘val’ [-Wunused-variable] int val, rx, ry, p, q, i; ^ user.cpp: In function ‘void read()’: user.cpp:49:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banana.in", "r", stdin); ^ user.cpp:50:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:52:41: 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); ^ user.cpp: In function ‘int root(int)’: user.cpp:60:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘void write()’: user.cpp:96:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banana.out", "w", stdout); ^