Compilare: main.cpp: In member function 'void Graph::TS_read()': main.cpp:255:14: warning: passing NULL to non-pointer argument 1 of 'void exit(int)' [-Wconversion-null] 255 | exit(NULL); | ^~~~ In file included from /usr/include/c++/10/bits/std_abs.h:38, from /usr/include/c++/10/cmath:47, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41, from main.cpp:1: /usr/include/stdlib.h:617:23: note: declared here 617 | extern void exit (int __status) __THROW __attribute__ ((__noreturn__)); | ~~~~^~~~~~~~ main.cpp: In member function 'void Graph::biconex()': main.cpp:295:14: warning: passing NULL to non-pointer argument 1 of 'void exit(int)' [-Wconversion-null] 295 | exit(NULL); | ^~~~ In file included from /usr/include/c++/10/bits/std_abs.h:38, from /usr/include/c++/10/cmath:47, from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41, from main.cpp:1: /usr/include/stdlib.h:617:23: note: declared here 617 | extern void exit (int __status) __THROW __attribute__ ((__noreturn__)); | ~~~~^~~~~~~~ main.cpp: In member function 'int Graph::MaxFlow(int, int, int)': main.cpp:441:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<edge> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 441 | for(int i = 0; i < adj_flow.size(); i++) | ~~^~~~~~~~~~~~~~~~~ main.cpp:443:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 443 | for(int j = 0; j <adj_flow[i].size(); j++) | ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:532:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 532 | for(int i = 0; i < res.size(); i++){ | ~~^~~~~~~~~~~~