Compilare: user.cpp: In function ‘void writeData()’: user.cpp:94:53: warning: unknown conversion type character ‘R’ in format [-Wformat=] printf("%R %d ", Edges[sol[i + 1]].first); ^ user.cpp: In function ‘void readData()’: user.cpp:31:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:33:40: 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); ^