Compilare: main.cpp: In function 'int solve(LL)': main.cpp:81:13: warning: unused variable 'st' [-Wunused-variable] int st = i, dr = N; ^~ main.cpp:81:21: warning: unused variable 'dr' [-Wunused-variable] int st = i, dr = N; ^~ main.cpp: In function 'int main()': main.cpp:94:37: 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:95:39: 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:98:32: 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:99:52: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 0; i < M; i++) scanf("%lld", &a[i]); ^ main.cpp:100:52: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for(int i = 0; i < M; i++) scanf("%lld", &b[i]); ^