Compilare: main.cpp: In function 'int main()': main.cpp:10:15: warning: unused variable 'x1' [-Wunused-variable] long long x1, y1, z1, c; ^~ main.cpp:10:19: warning: unused variable 'y1' [-Wunused-variable] long long x1, y1, z1, c; ^~ main.cpp:10:23: warning: unused variable 'z1' [-Wunused-variable] long long x1, y1, z1, c; ^~ main.cpp:15:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%lld%d", &n, &m, &c, &r); ^ main.cpp:16:45: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d%d", &x, &y, &z, &w, &u); ^ main.cpp:19:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &mat[1][i]); ^ main.cpp:21:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &mat[i][1]); ^