Compilare: main.cpp: In function 'int main()': main.cpp:52:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^ main.cpp:53:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &x); ^ main.cpp:55:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &roads[i].distance); ^ main.cpp:57:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &roads[i].speed); ^ main.cpp:17:58: warning: 'minTimeSaved' may be used uninitialized in this function [-Wmaybe-uninitialized] return ceil(-0.5 + sqrt(1.0 + 4.0 * (double)distance / minIncrease) / 2); ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:142:30: note: 'minTimeSaved' was declared here double left, right, mid, minTimeSaved; ^~~~~~~~~~~~ main.cpp:150:19: warning: 'right' may be used uninitialized in this function [-Wmaybe-uninitialized] mid = (left + right) / 2; ~~~~~~^~~~~~~~