Compilare: user.cpp: In function ‘void solve_dp_cum(int)’: user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<fii[nod].size(); j ++) ^ user.cpp: In function ‘int main()’: user.cpp:141:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("hacker2.in", "r", stdin); ^ user.cpp:142:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("hacker2.out", "w", stdout); ^ user.cpp:144:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:150:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &X, &Y, &D); ^ user.cpp:164:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &nod, &dist); ^ user.cpp: In function ‘void solve_dp_cum(int)’: user.cpp:39:19: warning: ‘P’ may be used uninitialized in this function [-Wmaybe-uninitialized] cum[X] = P; ^