Compilare: main.cpp: In function 'void solve(std::vector<int>, std::vector<std::pair<int, int> >)': main.cpp:35:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (output < 1 || output > arr.size() || arr[output - 1] != it->second) { ~~~~~~~^~~~~~~~~~~~ main.cpp: In function 'void read(int&, int&, std::vector<int>&, std::vector<std::pair<int, int> >&)': main.cpp:11:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:14:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &arr_val); ^ main.cpp:18:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ main.cpp:21:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &query_type, &query_val); ^ main.cpp: In function 'int main()': main.cpp:54:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.in", "r", stdin); ^ main.cpp:55:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.out", "w", stdout); ^