Compilare: main.cpp: In function 'void afisare(std::vector<std::vector<int> >&)': main.cpp:17:28: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 17 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:17:28: note: use reference type to prevent copying 17 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ | & main.cpp: In member function 'void graf::island_mark(int, int)': main.cpp:105:32: warning: loop variable 'neigbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 105 | for (const vector<int> neigbor : neighbors) /// visiting island neighbors | ^~~~~~~ main.cpp:105:32: note: use reference type to prevent copying 105 | for (const vector<int> neigbor : neighbors) /// visiting island neighbors | ^~~~~~~ | & main.cpp: In constructor 'graf::graf(std::vector<std::vector<int> >&)': main.cpp:146:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 146 | for(int i = 0; i < neighbors.size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:147:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 147 | for(int j = 0; j < neighbors[i].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In constructor 'graf::graf(int, std::vector<std::vector<int> >&)': main.cpp:154:32: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 154 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:154:32: note: use reference type to prevent copying 154 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ | & main.cpp: In member function 'void graf::afisare()': main.cpp:186:32: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 186 | for (const vector<int> neighbor : this->graph) | ^~~~~~~~ main.cpp:186:32: note: use reference type to prevent copying 186 | for (const vector<int> neighbor : this->graph) | ^~~~~~~~ | & main.cpp: In member function 'std::vector<int> graf::topologicalSort()': main.cpp:253:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 253 | if(sol.size()==nodes)/// checking if is not a cycle in graph | ~~~~~~~~~~^~~~~~~ main.cpp: In member function 'int graf::shortestBridge()': main.cpp:310:40: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 310 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:310:40: note: use reference type to prevent copying 310 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~