Compilare: main.cpp: In function 'void dijkstra(int, int)': main.cpp:38:58: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(int i = 0; i < portals.size(); i++) { | ~~^~~~~~~~~~~~~~~~ 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(const _T1&, const _T2&) requires _S_constructible<const _T1&, const _T2&>() [with _T1 = int; _T2 = std::pair<int, int>]', inlined from 'void dijkstra(int, int)' at main.cpp:45:13: /usr/include/c++/12.2.1/bits/stl_pair.h:272:21: warning: 'choseny' may be used uninitialized [-Wmaybe-uninitialized] 272 | : first(__x), second(__y) | ^~~~~~~~~~~ main.cpp: In function 'void dijkstra(int, int)': main.cpp:37:54: note: 'choseny' was declared here 37 | int chosenx, choseny; | ^~~~~~~ In constructor 'constexpr std::pair<_T1, _T2>::pair(const _T1&, const _T2&) requires _S_constructible<const _T1&, const _T2&>() [with _T1 = int; _T2 = std::pair<int, int>]', inlined from 'void dijkstra(int, int)' at main.cpp:45:13: /usr/include/c++/12.2.1/bits/stl_pair.h:272:21: warning: 'chosenx' may be used uninitialized [-Wmaybe-uninitialized] 272 | : first(__x), second(__y) | ^~~~~~~~~~~ main.cpp: In function 'void dijkstra(int, int)': main.cpp:37:45: note: 'chosenx' was declared here 37 | int chosenx, choseny; | ^~~~~~~ main.cpp: In function 'int main()': main.cpp:100:32: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized] 100 | printf("%d", (dist[x][y] == INF ? -1 : dist[x][y])); | ~~~~~~~~~^ main.cpp:77:22: note: 'y' was declared here 77 | int a, b, x, y; | ^ main.cpp:100:32: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized] 100 | printf("%d", (dist[x][y] == INF ? -1 : dist[x][y])); | ~~~~~~~~~^ main.cpp:77:19: note: 'x' was declared here 77 | int a, b, x, y; | ^ main.cpp:98:17: warning: 'a' may be used uninitialized [-Wmaybe-uninitialized] 98 | dijkstra(a, b); | ~~~~~~~~^~~~~~ main.cpp:77:13: note: 'a' was declared here 77 | int a, b, x, y; | ^ main.cpp:98:17: warning: 'b' may be used uninitialized [-Wmaybe-uninitialized] 98 | dijkstra(a, b); | ~~~~~~~~^~~~~~ main.cpp:77:16: note: 'b' was declared here