Compilare: main.cpp: In function 'int main()': main.cpp:52:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr < q[b].size ()) { ~~~~^~~~~~~~~~~~~~ main.cpp:50:18: warning: unused variable 'start' [-Wunused-variable] int cycle = 1, start = (b + 1) * 400, ptr = 0; ^~~~~ main.cpp:30:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("perioada.in", "r", stdin); ^ main.cpp:31:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("perioada.out", "w", stdout); ^