Compilare: main.cpp: In function 'int main()': main.cpp:104:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("ksecv4.in", "r",stdin); ^ main.cpp:105:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv4.out", "w",stdout); ^ main.cpp:107:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &k, &m); ^ main.cpp:109:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &a[i]); ^ main.cpp:111:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &b[i]); ^ main.cpp: In function 'int bss(int, int, long long int)': main.cpp:76:12: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^~~~