Compilare: main.cpp: In function 'void find_chain(int, int)': main.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i = 0; i < G[node].size(); ++i) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void create_tree()': main.cpp:82:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 82 | for (int i = 0; i < G[node].size(); ++i) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int compute_dp(int)': main.cpp:114:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 114 | for (int i = 0; i < ARB[root].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:122:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 122 | for (int i = 0; i < ARB[root].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:135:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 135 | for (int i = 0; i < ARB[root].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:136:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 136 | for (int j = i + 1; j < ARB[root].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:155:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 155 | for (int i = 0; i < ARB[root].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void print_graph()': main.cpp:179:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 179 | for (int j = 0; j < G[i].size(); ++j) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void print_tree()': main.cpp:191:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 191 | for (int j = 0; j < ARB[i].size(); ++j) | ~~^~~~~~~~~~~~~~~