Compilare: main.cpp: In function 'void Solve1()': main.cpp:47:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + k - 1 < ans.size();) { ~~~~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:112:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mirror.in", "r", stdin); ^ main.cpp:113:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mirror.out", "w", stdout); ^ main.cpp:115:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &task, &n, &k); ^ main.cpp:118:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^