Compilare: main.cpp: In function 'int main()': main.cpp:15:36: 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); ^ main.cpp:16:38: 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); ^ main.cpp: In function 'void solve()': main.cpp:51:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^ main.cpp:54:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(j=22; j>=1; --j) {scanf("%lld", &lst[j]); if(lst[j]) ++cnt;} ^