Compilare: main.cpp: In function 'void constr(std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, std::queue<std::pair<int, int> >&)': main.cpp:17:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | if(nx >= 1 && nx < v.size() && ny >= 1 && ny < v[0].size() && !v[nx][ny] && !dis[nx][ny]) | ~~~^~~~~~~~~~ main.cpp:17:58: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 17 | if(nx >= 1 && nx < v.size() && ny >= 1 && ny < v[0].size() && !v[nx][ny] && !dis[nx][ny]) | ~~~^~~~~~~~~~~~~ main.cpp: In function 'bool check(std::vector<std::vector<int> >&, std::vector<std::vector<int> >&, int, int, int, int, int)': main.cpp:46:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if(nx >= 1 && nx < v.size() && ny >= 1 && ny < v[0].size() && !v[nx][ny] && !vis[nx][ny]) | ~~~^~~~~~~~~~ main.cpp:46:58: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | if(nx >= 1 && nx < v.size() && ny >= 1 && ny < v[0].size() && !v[nx][ny] && !vis[nx][ny]) | ~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:17: warning: 'ey' may be used uninitialized [-Wmaybe-uninitialized] 102 | if(check(v, dis, sx, sy, ex, ey, mid)) | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:66:21: note: 'ey' was declared here 66 | int sx, sy, ex, ey; | ^~ main.cpp:102:17: warning: 'ex' may be used uninitialized [-Wmaybe-uninitialized] 102 | if(check(v, dis, sx, sy, ex, ey, mid)) | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:66:17: note: 'ex' was declared here 66 | int sx, sy, ex, ey; | ^~ main.cpp:102:17: warning: 'sy' may be used uninitialized [-Wmaybe-uninitialized] 102 | if(check(v, dis, sx, sy, ex, ey, mid)) | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:66:13: note: 'sy' was declared here 66 | int sx, sy, ex, ey; | ^~ main.cpp:102:17: warning: 'sx' may be used uninitialized [-Wmaybe-uninitialized] 102 | if(check(v, dis, sx, sy, ex, ey, mid)) | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:66:9: note: 'sx' was declared here 66 | int sx, sy, ex, ey; | ^~