Compilare: user.cpp: In function ‘int main()’: user.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pz[i]!=v[i].size()) ^ user.cpp:37:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pz[nod]==v[nod].size()) ^ user.cpp:46:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pz[nod]==v[nod].size()) ^ user.cpp:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pz[nod]==v[nod].size()) ^ user.cpp:15:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nowhere-zero.in", "r", stdin); ^ user.cpp:16:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nowhere-zero.out", "w", stdout); ^ user.cpp:18:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:21:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &xx, &yy); ^ user.cpp:25:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a[i], &b[i]); ^