Compilare: user.cpp: In function ‘int main()’: user.cpp:32:6: warning: unused variable ‘start’ [-Wunused-variable] int start = 0; ^~~~~ user.cpp:33:6: warning: unused variable ‘end’ [-Wunused-variable] int end = 0; ^~~ user.cpp:16:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jocul.in", "r", stdin); ^ user.cpp:17:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jocul.out", "w", stdout); ^ user.cpp:19:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:25:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:38:11: warning: iteration 50005 invokes undefined behavior [-Waggressive-loop-optimizations] if (m[k] && k + x <= t) { ~~~^ user.cpp:37:21: note: within this loop for (int k = 0; k <= MAXN; ++k) { ^