Compilare: main.cpp: In function 'int solve(int)': main.cpp:52:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:54:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ main.cpp: In function 'int main()': main.cpp:70:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("flooow.in", "r", stdin); ^ main.cpp:71:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("flooow.out", "w", stdout); ^ main.cpp:74:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ main.cpp: In function 'int solve(int)': main.cpp:66:15: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return check(n, last).s + k * last; ~~~~~^~~~~~~~~