Compilare: user.cpp: In function ‘void Solve()’: user.cpp:66:58: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (ef[iv][jv] > Ef ||fabs(ef[iv][jv] - Ef) < EPS && a[iv][jv] > a[i][j] + Dist(i, j, iv, jv)) ^ user.cpp: In function ‘void Read()’: user.cpp:20:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN, "r", stdin); ^ user.cpp:21:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %lf", &n, &m, &Lmax); ^ user.cpp:24:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &c[i][j]); ^ user.cpp:25:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &ip, &jp, &is, &js); ^ user.cpp: In function ‘int main()’: user.cpp:84:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT, "w", stdout); ^