Compilare: user.cpp: In function ‘int main()’: user.cpp:13:53: warning: unused variable ‘c’ [-Wunused-variable] int x, y, n, l, i, j, p, start, stop, nri, ans, c; ^ user.cpp:11:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in", "r", stdin); ^ user.cpp:12:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out", "w", stdout); ^ user.cpp:14:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &x, &y, &n, &l); ^ user.cpp:18:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &d[i]); ^ user.cpp:13:37: warning: ‘stop’ may be used uninitialized in this function [-Wmaybe-uninitialized] int x, y, n, l, i, j, p, start, stop, nri, ans, c; ^ user.cpp:13:30: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] int x, y, n, l, i, j, p, start, stop, nri, ans, c; ^