Compilare: main.cpp: In function 'bool ok(long long int)': main.cpp:46:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<event>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | while (i < e.size()) { | ~~^~~~~~~~~~ main.cpp:48:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<event>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | while (j < e.size() && e[i].x == e[j].x) { | ~~^~~~~~~~~~ main.cpp:114:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<event>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 114 | if (j == e.size()) | ~~^~~~~~~~~~~