Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:32:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in", "r", stdin); ^ user.cpp:33:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out", "w", stdout); ^ user.cpp:34:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:37:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&ab[i].first,&ab[i].second); ^ /tmp/cctAedV0.o: In function `main': user.cpp:(.text.startup+0x137): undefined reference to `dist(std::pair<int, int>, std::pair<int, int>)' user.cpp:(.text.startup+0x1a0): undefined reference to `dist(std::pair<int, int>, std::pair<int, int>)' collect2: error: ld returned 1 exit status