Compilare: user.cpp: In function ‘int main()’: user.cpp:119:35: 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); ^ user.cpp:120:37: 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); ^ user.cpp:121:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:123:34: 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 bs()’: user.cpp:114:9: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^