Compilare: user.cpp: In function ‘int invm(int)’: user.cpp:11:9: warning: unused variable ‘i’ [-Wunused-variable] int i, p = r - 2, ans = 1, aux = x; ^ user.cpp: In function ‘void solve()’: user.cpp:65:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (l = 0; l < V[v[j]].size(); ++ l) ^ user.cpp: In function ‘void read()’: user.cpp:39:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teroristi2.in", "r", stdin); ^ user.cpp:40:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &k, &r); ^ user.cpp:43:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘void write()’: user.cpp:80:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teroristi2.out", "w", stdout); ^