Compilare: user.cpp: In function ‘int main()’: user.cpp:47:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(p=0; p<g[l].size(); ++p){ ^ user.cpp:19:18: warning: unused variable ‘q’ [-Wunused-variable] int i, j, l, q, p; ^ user.cpp:20:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reinvent.in", "r", stdin); ^ user.cpp:21:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reinvent.out", "w", stdout); ^ user.cpp:22:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &p, &nx); ^ user.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &i, &j); ^ user.cpp:34:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1; i<=nx; ++i)scanf("%d", &x[i]); ^