Compilare: main.cpp: In function 'int main()': main.cpp:53:58: warning: unused variable 'last' [-Wunused-variable] long long n, i, m, pivot, R, x, y, z, w, u, j, dr, st, last ; ^~~~ main.cpp:56:53: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld%lld%lld%lld", &n, &m, &c, &R ) ; ^ main.cpp:57:61: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld%lld%lld%lld%lld", &x, &y, &z, &w, &u ) ; ^ main.cpp:60:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld", &mat[1][j] ) ; ^ main.cpp:63:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld", &mat[i][1] ) ; ^