Compilare: main.cpp: In function 'int main()': main.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size();) { ~~^~~~~~~~~~ main.cpp:46:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < v.size() && v[i] == v[j]) j++; ~~^~~~~~~~~~ main.cpp:20:27: warning: typedef 'using ii = struct std::pair<int, int>' locally defined but not used [-Wunused-local-typedefs] using ii = pair<int, int>; ^ main.cpp:5:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate3.in", "r", stdin); ^ main.cpp:6:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("patrate3.out", "w", stdout); ^ main.cpp:8:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp: In lambda function: main.cpp:12:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d.%d", &x, &y); ^