Compilare: user.cpp: In function ‘void readData()’: user.cpp:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); M = N * (N - 1) / 2; ^ user.cpp:39:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int u, v; scanf("%d%d", &u, &v); ^ user.cpp: In function ‘void solveComponent(int)’: user.cpp:174:25: warning: ‘node_2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int node_1, node_2; ^ user.cpp:187:39: warning: ‘node_1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(adj[path[i]][node_1] && adj[node_2][path[i + 1]]) { ^