Compilare: main.cpp: In function 'int main()': main.cpp:13:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("intersect.in", "r", stdin); ^ main.cpp:14:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("intersect.out", "w", stdout); ^ main.cpp:22:14: warning: iteration 11175 invokes undefined behavior [-Waggressive-loop-optimizations] if(dp[i][j]) ~~~~~~~^ main.cpp:21:20: note: within this loop for(int j = 0; j <= LIM; ++j) ~~^~~~~~