Compilare: main.cpp: In function 'int find(int)': main.cpp:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for(int i = 0; i < t[key].size(); ++ i) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:33:24: warning: unused variable 'key' [-Wunused-variable] 33 | int n, m, cnt = 0, key; | ^~~