Compilare: In file included from /usr/include/c++/12.2.1/bits/stl_algobase.h:64, from /usr/include/c++/12.2.1/bits/specfun.h:45, from /usr/include/c++/12.2.1/cmath:1935, from /usr/include/c++/12.2.1/x86_64-pc-linux-gnu/bits/stdc++.h:41, from main.cpp:1: In constructor 'constexpr std::pair<_T1, _T2>::pair(_U1&&, _U2&&) [with _U1 = int&; _U2 = int&; _T1 = int; _T2 = int]', inlined from 'int main()' at main.cpp:52:11: /usr/include/c++/12.2.1/bits/stl_pair.h:281:42: warning: 'cj' may be used uninitialized [-Wmaybe-uninitialized] 281 | : first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:19: note: 'cj' was declared here 29 | int n, m, ci, cj, cnt=0; | ^~ In constructor 'constexpr std::pair<_T1, _T2>::pair(_U1&&, _U2&&) [with _U1 = int&; _U2 = int&; _T1 = int; _T2 = int]', inlined from 'int main()' at main.cpp:52:11: /usr/include/c++/12.2.1/bits/stl_pair.h:281:11: warning: 'ci' may be used uninitialized [-Wmaybe-uninitialized] 281 | : first(std::forward<_U1>(__x)), second(std::forward<_U2>(__y)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:29:15: note: 'ci' was declared here 29 | int n, m, ci, cj, cnt=0; | ^~