Compilare: main.cpp: In function 'void afisare(std::vector<std::vector<int> >&)': main.cpp:20:28: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 20 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:20:28: note: use reference type to prevent copying 20 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ | & main.cpp: In member function 'void graf::island_mark(int, int)': main.cpp:108:32: warning: loop variable 'neigbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 108 | for (const vector<int> neigbor : neighbors) /// visiting island neighbors | ^~~~~~~ main.cpp:108:32: note: use reference type to prevent copying 108 | for (const vector<int> neigbor : neighbors) /// visiting island neighbors | ^~~~~~~ | & main.cpp: In constructor 'graf::graf(std::vector<std::vector<int> >&)': main.cpp:149:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 149 | for(int i = 0; i < neighbors.size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:150:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 150 | for(int j = 0; j < neighbors[i].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In constructor 'graf::graf(int, std::vector<std::vector<int> >&)': main.cpp:157:32: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 157 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:157:32: note: use reference type to prevent copying 157 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ | & main.cpp: In member function 'void graf::afisare()': main.cpp:189:32: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 189 | for (const vector<int> neighbor : this->graph) | ^~~~~~~~ main.cpp:189:32: note: use reference type to prevent copying 189 | for (const vector<int> neighbor : this->graph) | ^~~~~~~~ | & main.cpp: In member function 'std::vector<int> graf::topologicalSort()': main.cpp:256:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 256 | if(sol.size()==nodes)/// checking if is not a cycle in graph | ~~~~~~~~~~^~~~~~~ main.cpp: In member function 'int graf::shortestBridge()': main.cpp:313:40: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 313 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:313:40: note: use reference type to prevent copying 313 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~