Compilare: main.cpp: In function 'void dfs(int)': main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfst(int)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < T[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'void dfsctc(int)': main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < C[u].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:106:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < G[i].size() ; j ++) ~~^~~~~~~~~~~~~ main.cpp:147:48: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n" , mch.size() + in0.size() - 1); ^ main.cpp:148:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < mch.size() ; i ++) ~~^~~~~~~~~~~~ main.cpp:87:39: warning: unused variable 'cuplaj' [-Wunused-variable] int n , m , x , y , i , j , nod , cuplaj , gasit; ^~~~~~ main.cpp:87:48: warning: unused variable 'gasit' [-Wunused-variable] int n , m , x , y , i , j , nod , cuplaj , gasit; ^~~~~ main.cpp:85:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("plan.in" , "r" , stdin); ^ main.cpp:86:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("plan.out" , "w" , stdout); ^ main.cpp:88:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &m); ^ main.cpp:91:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &x , &y); ^