Compilare: user.cpp: In function ‘void compute(int)’: user.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<G[i].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:80:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x; ^ user.cpp:77:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zumzi.in", "r", stdin); ^ user.cpp:78:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zumzi.out", "w", stdout); ^ user.cpp:82:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &k, &stop); ^ user.cpp:86:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^