Compilare: main.cpp: In function 'void solve()': main.cpp:4:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define fin(i, s, n) for(auto i = s; i < n; ++i) main.cpp:39:9: fin(i, 0, evs.size()) starter[evs[i].x] = min(starter[evs[i].x], i); ~~~~~~~~~~~~~~~~ main.cpp:39:5: note: in expansion of macro 'fin' fin(i, 0, evs.size()) starter[evs[i].x] = min(starter[evs[i].x], i); ^~~ main.cpp: In function 'int32_t main()': main.cpp:84:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sumzero.in", "r", stdin); ^ main.cpp:85:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("sumzero.out", "w", stdout); ^