Compilare: user.cpp: In function ‘int main()’: user.cpp:128:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < ll.size() && ll[i].dist <= k; i++) { ^ user.cpp:102:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.in", "r", stdin); ^ user.cpp:103:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elicoptere.out", "w", stdout); ^ user.cpp:104:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &vv, &n, &k); ^ user.cpp:108:65: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d", &x1, &y1, &x2, &y2, &x3, &y3); ^