Compilare: user.cpp: In function ‘void sol(int, std::vector<edge>, int, int, long long int, std::vector<int>)’: user.cpp:127:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1 < newed.size() || p2 < newq1.size()) { ^ user.cpp:127:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1 < newed.size() || p2 < newq1.size()) { ^ user.cpp:128:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p1 >= newed.size()) { ^ user.cpp:133:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p2 >= newq1.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:154:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rutier.in", "r", stdin); ^ user.cpp:155:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rutier.out", "w", stdout); ^ user.cpp:163:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &c, &d); ^ user.cpp:173:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &q[i].a, &q[i].b, &q[i].c); ^