Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:28:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p + dp_cnt[i + 1][j] - 1 >= st) ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ main.cpp: In function 'int main()': main.cpp:39:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("summax.in", "r", stdin); ^ main.cpp:40:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out", "w", stdout); ^