Compilare: main.cpp: In function 'void solve(int, int)': main.cpp:93:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p < pfx.size() && pfx[p] <= val) p++; ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bvarcolaci.in", "r", stdin); ^ main.cpp:103:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bvarcolaci.out", "w", stdout); ^