Compilare: main.cpp: In function 'int toposort(std::vector<int>*, int, int*)': main.cpp:19:12: warning: unused variable 'j' [-Wunused-variable] int i, j, depth = 0, l = 0, length = 1, new_length = 0; ^ main.cpp:63:16: warning: unused variable 'pp' [-Wunused-variable] struct per pp; ^~ main.cpp:78:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:81:9: warning: unused variable 'i' [-Wunused-variable] int i, j, n, m, x, y; ^ main.cpp:81:12: warning: unused variable 'j' [-Wunused-variable] int i, j, n, m, x, y; ^ main.cpp:95:10: warning: unused variable 'ans' [-Wunused-variable] int *ans = (int*)malloc(100 * sizeof(int)); ^~~ main.cpp:85:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in", "r", stdin); ^ main.cpp:86:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out", "w", stdout); ^ main.cpp:88:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ main.cpp:90:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^