Compilare: user.cpp: In function ‘int main()’: user.cpp:10:20: warning: unused variable ‘m’ [-Wunused-variable] int v[100], n, m, s=0, sum, p, k, x, y; ^ user.cpp:7:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("coins.in", "r", stdin); ^ user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("coins.out", "w", stdout); ^ user.cpp:12:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:18:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[j]); ^ user.cpp:36:19: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[y]=1; ^ user.cpp:22:3: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (p!=sum) ^