Compilare: user.cpp: In function ‘int main()’: user.cpp:45:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = StartR; i < Ans.size() - 1; i += 2) printf("%i %i ", X[Ans[i]], Y[Ans[i]]); ^ user.cpp:47:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = StartB; i < Ans.size() - 1; i += 2) printf("%i %i ", X[Ans[i]], Y[Ans[i]]); ^ user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.in", "r", stdin); ^ user.cpp:17:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out", "w", stdout); ^ user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &N, &M); ^ user.cpp:22:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i %c", &X[i], &Y[i], &Type[i]); ^