Compilare: user.cpp: In function ‘int src(coord)’: user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (step = 1; step < vec.size(); step <<= 1); ^ user.cpp:50:14: warning: statement has no effect [-Wunused-value] for (step; step; step >>= 1) ^ user.cpp:51:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (val + step < vec.size() && vec[val+step] <= v) ^ user.cpp: In function ‘void read()’: user.cpp:34:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:36:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a[i].x, &a[i].y); ^ user.cpp: In function ‘int main()’: user.cpp:84:34: 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:85:36: 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); ^