Compilare: user.cpp: In function ‘void solve()’: user.cpp:66:26: warning: unused variable ‘start’ [-Wunused-variable] int source, i, j, k, start, finish; ^ user.cpp:66:33: warning: unused variable ‘finish’ [-Wunused-variable] int source, i, j, k, start, finish; ^ user.cpp: In function ‘void read()’: user.cpp:25:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &t); ^ user.cpp:28:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i].x); ^ user.cpp:45:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &c); ^