Compilare: main.cpp: In function 'int main()': main.cpp:53:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi.in", "r", stdin); ^ main.cpp:54:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stalpi.out", "w", stdout); ^ main.cpp:55:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int n; scanf("%d", &n); ^ main.cpp:57:71: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &plr[i].ps, &plr[i].cs, &plr[i].le, &plr[i].ri); ^ main.cpp:81:39: warning: 'psr' may be used uninitialized in this function [-Wmaybe-uninitialized] update(1, 0, n, psr, cs + plr[i].cs); ^ main.cpp:80:23: warning: 'psl' may be used uninitialized in this function [-Wmaybe-uninitialized] long long cs = query(1, 0, n, psl - 1, n); ~~~~~^~~~~~~~~~~~~~~~~~~~~