Compilare: main.cpp: In function 'void afisare(std::vector<std::vector<int> >&)': main.cpp:12:28: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 12 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:12:28: note: use reference type to prevent copying 12 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ | & main.cpp: In member function 'void graf::island_mark(int, int)': main.cpp:100:32: warning: loop variable 'neigbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 100 | for (const vector<int> neigbor : neighbors) /// visiting island neighbors | ^~~~~~~ main.cpp:100:32: note: use reference type to prevent copying 100 | for (const vector<int> neigbor : neighbors) /// visiting island neighbors | ^~~~~~~ | & main.cpp: In constructor 'graf::graf(std::vector<std::vector<int> >&)': main.cpp:141:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 141 | for(int i = 0; i < neighbors.size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:142:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 142 | for(int j = 0; j < neighbors[i].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In constructor 'graf::graf(int, std::vector<std::vector<int> >&)': main.cpp:149:32: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 149 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:149:32: note: use reference type to prevent copying 149 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ | & main.cpp: In member function 'void graf::afisare()': main.cpp:181:32: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 181 | for (const vector<int> neighbor : this->graph) | ^~~~~~~~ main.cpp:181:32: note: use reference type to prevent copying 181 | for (const vector<int> neighbor : this->graph) | ^~~~~~~~ | & main.cpp: In member function 'std::vector<int> graf::topologicalSort()': main.cpp:248:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 248 | if(sol.size()==nodes)/// checking if is not a cycle in graph | ~~~~~~~~~~^~~~~~~ main.cpp: In member function 'int graf::shortestBridge()': main.cpp:305:40: warning: loop variable 'neighbor' creates a copy from type 'const std::vector<int>' [-Wrange-loop-construct] 305 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~ main.cpp:305:40: note: use reference type to prevent copying 305 | for (const vector<int> neighbor : neighbors) | ^~~~~~~~