Compilare: main.cpp: In function 'int main()': main.cpp:78:19: warning: unused variable 'lin' [-Wunused-variable] int n, i, j, k, lin, cost_total = 0; ^~~ main.cpp:80:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ main.cpp:82:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &v[i].x, &v[i].y); ^